Just looked at your video a few minutes ago and with all the concerns I had in mind about a possible fire I took my two batteries outside to do it. Like magic it really works. Thanks! You saved me a bundle. I live in the Caribbean ordering a lithium battery online means shipping to Miami first and then paying air freight to my island then pay customs. A forty dollar battery means $108 in my currency (East Caribbean Dollar). Shipping it is about $35 in our money then customs on a good day will charge 40% around $57 for the importation costing me around EC200. Thank goodness I found this video and thank heavens you shared the info. Thanks again.
Lithium batteries are not designed to be used beyond a low threshold of power, usually nothing less than 40% or so, and in most cases the internal circuit board is the charging monitor and it is designed to shut off at a specific point to not allow a lower level of discharge. If a battery sits long enough it will self discharge below this level. Jumping the dead battery charges the capacitor on the monitoring circuit, allowing it to believe it has the lower limit and it adjusts to allow charging. I use an 18 GA wire with a bent loop at the end to plug into contacts lie this in order to not spread the contacts too far. This is a good video, Thank you for posting.
I have a Craftsman 19.2 battery. I bought a charger for it. But I have no way to jump-started except off my Dewalt batteries. What should I do and how do I do it
Thanks, friend. I ruined my Ryobi 18v model P102 by leaving it in charger but in my frozen garage over winter, now dead. Don't have a mate to jump start but do have a B&D 18v p pack. Worth a shot with this method?
Hey man thanks! We are having a snowstorm and I got out my Snow Joe snowblower. I found 3 out of 4 batteries dead. They cost $200 apiece! I tried your fix and it brought all of them back to life! Excellent!!!
So.... That worked like a charm!! I watched the clip earlier, gave you the like before I tried it I was that confident. Worked so well I had to return and comment. So for all those who've done this and it worked, Thank you!
What a brilliant tip !! I had a battery that I thought was dead and had put it to one side for when we went to a battery collection place. I saw this tip and gave it a go.....WOW !! Just gave it a one second jump and tried it in the charger and hey presto, battery now charging. Thank you so much for sharing this with us.
Question: How good is your batteries now? I mean after your success, is it still working good now? I just threw away one death Makita battery two weeks ago. If I watched this video before, I tried to do it like you. Thanks
Hi does this work on batt that no longer fully charges ie 2 out of 3 light s when charged Also a one off , can it charge of f another same size batt Thx Joe
@joebalkovics3322 It does work. It's really for a battery that won't charge at all. Try to jump off with a good battery of the same kind. Just follow the directions in the video. If the battery is totally shot or dead, then probably not. A battery that will not fully charge as you described is on its way out.
I’ve just done what he showed me and it’s worked. Not used the battery for nearly 2 years as I thought it was totally gone. It’s now charging. Thankyou very much.
Pls report back on how much work can the revived battery do. I try to store lithium batteries around 20-30% full but sometimes they bleed out their juice before the next top-up.
Have a Harbor-Freight 20v 5 ah battery that went dead from lack of use / charging (only used it once in the past two years)...charger lights would only flash...Didn't want to hunt down some solid wire...so I used 4 "t-pins" from my local fabric store inserted into the battery slots...(picked that idea up from the South Main Auto channel) and a pair of alligator jumper wires...got a spark upon touching the negative t-pin...so i sparked it again...immediately put the battery on the charger...IT IS NOW CHARGING!!!! In the words of Elvis: "Thankyouverymuccchh!"
I used to design lithium battery charging circuits. To extend battery life.... 1. Let battery rest after use before charging. 2. Wait after charging before using. 3. Don't store fully charged or highly discharged. 4. Stay within 10% charged and 90% charged as much as possible. If this nice trick of this video doen't work then most likely still only 1 of the 5 batteries is dead and 4 are usually still as good as new. (20 volts is 5 batteries in series). Just replace the 1 dead battery.
THANK YOU SOOOOO MUCH! Had two new Black & Decker batteries that had been left too long without use and the charger would just flash red errors and do nothing. This worked INSTANTLY! They're now charging green!
Thank you for this video! I have 40v Ryobi tools and one of the batteries suddenly would not take a charge. I decided to try your method, but checked voltage first. The 'dead' one was showing less than 2v. When I jumped a good battery to the dead one, I got a spark when connecting the negative terminal, but only once. I checked the voltage again and that battery was almost up to 40 volts. I put it in the charger and it immediately started charging. Saved me $100+ for a genuine Ryobi replacement ($60+ for a knockoff).
Glad to see this comment. I have a 40v kobalt I want to try this on. Per another comment I’m waiting till I have one of my other 40v batteries to be at about half charge since fully charged ones may not work for the jump.
Thank you for this. I had a 20v max DeWalt battery that has been non responsive for over 6 months now. I followed your steps and 'boom', back to life. I'm glad I didn't discard it!
I had two six amp hour DeWalt 20 volt batteries that I was ready to toss I did this and they are now taking a charge unbelievable! This really works I was skeptical but you just saved me from having to replace two six amp hour batteries! Thank you so much!
Thank you so much for posting this video. I have a simple question: Why doesn't the charger work while the jumping works? Doesn't charging mean equally jumping? Your method has not yet been tried on my four dead batteries, but I will this weekend, and I am so excited!
Worked like a charm on a cheap Chinese 21v battery for a handheld saw. Arrived from amazon seemingly dead. Saw a few little sparks when connecting the last negative wire. Thought that might have caused a problem, but it didn't. Thing charged right up and works perfectly now. Thanks a lot.
I have used this technique for 8v golf cart batteries. I boosted each battery with a 12v charger for a few minutes, then wired the batteries (6) in series for a total of 48V. The charger for the golf cart is "smart" and needs to see a minimum voltage to start charging. Thank you for providing this method for tool batteries, I would have never thought to do this.
I bought a Hart drill combo and the battery that came with it NEVER worked.......well...... until I watched your video and used your technique. Flawless!! Thank you, sir
The same problem happens with normal 12 car battery chargers, they have to see a certain voltage coming back from the battery to check polarity before starting a charge cycle, it is also a part of the 'anti-spark' and short circuit proofing that if you connect the clips together the charger will not pass any power. Sometimes to charge a battery you need to connect a 'good' battery in parallel to start the charge and after 10 minutes take the good battery away and the charger will happily carry on.
This is a great idea provided you Have 2 batteries and one is in good condition! Usually my situation is the battery will indicate charged, but only last a few minutes.
Saw this 2 years ago when you first posted it. Worked great! You've saved me over $1,200 in batteries! Where do I send your $600? :). Hey! Seriously! Thanks a million buddy! Take care! North Florida here!
Just done this. Dremel battery wouldn’t charge, looking to buy a new one (not cheap) came across this video and gave it a go. It worked battery now fully charged. Thank you.
Thank you from the UK, something i had never thought of, had two dead 1.5 mah B and D batteries, jump started from a 2.5 mah Power Exchange without issue, saved me buying yet another drill.
An incredibly useful tip. My son returned a totally exhausted Bosch hedge trimmer. I was about to toss the dead battery but tried this hack. It worked beautifully and has saved me at least £60. Thankyou!
Fan-TASTIC video. Who would believe that it's so simple to fix? The explanation makes perfect sense - without even the tiny amount of charge needed to send signal to charger that all's O.K. to recharge - it wont! This must save so many people (including myself) so much time and money. Many thanks for posting.
You misunderstood this, the charger is specifically designed to refuse charging a fully depleted pack, not even with a tiny current. A lithium Ion cell might be internally damaged if it is fully depleted in such a way that once it's fully charged agan (no matter how slowly) it can get internally shorted and bust into flames. Even a small cellphone battery might be enough to burn your house down. Some years ago I also thought I was very smart when doing this. I might still do it if I have to, it will work, but I would discard it as soon as possible after in a safe way.
I have a 15-year-old Hitachi drill and one of the batteries wouldn't charge. I did your trick, took five minutes, and worked like a charm. Thanks, bro!
*WELL DONE!!* As a some-time Home Depot hardware guy, it would so bum me out when DeWalt guys would come in with DOA batteries. This little hack will get a number of 'em back in business, and (as a retired economist) leave me with much happier customers. *THANKS.*
What gauge wire do I need to charge the batteries? I have the exact ones you demonstrated first. They are ok for now, but I’ve had to get rid of two sets now. I’m so happy to see everyone commenting that this hack works. Thankyou! 👍🏻
Any wire that's not to thin but will fit in the contact's, you only need to do it for a couple of seconds. But if it's a worn battery it'll not work, but if it's a couple of years old and only been charged less than a dozen times you should be good to go
Hey, I had the exact same battery that you recharged, and it worked like a charm. Battery would not come alive with no light in the charger, just like yours. After your B+, B - wire trick, charger light started blinking and Batt was fully charged in one and half hrs. Thanks a bunch!!!!!!
ABSOLUTELY happy to like your video. Thanks so much for sharing this. Wiring the batteries in parallel is a great tip to transfer just enough power to trick the charger. I had an old mobile phone battery that would not do anything and after putting it on and off the charger many times with zero life I put it in one last time and then it initiated the charger and charged and it's been fine ever since. But you're video jogged my memory so I can't wait to try your idea on my DeWalt 18 volt batteries that are lifeless through lack of use. I love my cordless tools but whenever you need a tool without fail it's always the Old Faithful corded tool that never fails. Cheers again.
Thank you! It’s crazy how much $$ these new batteries are! This happened to me years ago before I had seen this trick, and ended up buying a whole new tool bc it was just as much as buying new batteries!
Thank you, I bought a set and one battery never would charge, it’s been a few years. Your trick worked like a champ, thought I had nothing to lose. I’m back with 2 batteries working great.
I did not beleive this would work but! It Worked!!!!!!!!!!!! Amasing! Thank you very much sir. Is it normal that this shall get done every time with the old battery? I mean... the old battery which did not worked, did work after I did as you show , charged it, paced in on the tool and the tool worked perfectly. When I tried to recharge the old battery, the same happened as before , it could not charge and I had to make a new reboot. You help a lot good folks out there and you help this entire planet becasue recyckling and fixing stuff is always better than throwing a way! 👍
I never realized this about Lithium batteries and/or charging stations. I have a collection of older tools that I replaced because I did did not want to spend a fortune on a new battery just to have it fail. I 'm going to go back and make sure I try this. Thanks so much for bring this to light. The tool industry knows this too but they want to sell warrantees. Your the Man.
It's a good trick and thanks for the sharing but before you do this, it's necessary to know a little about how these batteries work in the first place. In a charged lithium-ion battery, lithium ions move from the negative electrode (made of a lithium compound) through an electrolyte to the positive electrode (commonly composed of a material like lithium cobalt oxide) when the battery is being discharged (i.e., when it's powering something). When the battery is being recharged, the opposite happens; the lithium ions move back to the negative electrode. Over time, several factors can cause a lithium-ion battery to lose its ability to hold a charge: Cycling: Each time a battery is discharged and recharged, it goes through a "cycle." Over many cycles, the battery's capacity (how much charge it can hold) decreases. This is in part due to the wear and tear on the electrodes from the physical movement of ions. As the ions embed and unembed during each cycle, they can cause structural damage to the electrodes. Solid Electrolyte Interface (SEI) layer: This is a layer that forms on the electrode's surface as the battery is used. The SEI layer is both beneficial and detrimental; it protects the electrolyte from further decomposition but also increases the internal resistance of the battery and reduces the cell's capacity. Over time, continued growth of the SEI layer can lead to significant capacity loss. Lithium Plating: When a battery is charged too quickly or at a low temperature, lithium ions may not have enough time to embed themselves back into the negative electrode. This can cause lithium to deposit as a metal on the electrode's surface, a process known as "lithium plating." Once this happens, those lithium ions are no longer available for charge/discharge cycles, reducing the battery's capacity. Electrolyte Decomposition: The electrolyte inside the battery can decompose due to high temperatures or overcharging, which can lead to gas formation. This can cause the battery to swell and potentially fail. When a lithium-ion battery "dies," it means that enough of these processes have occurred that the battery can no longer effectively store and deliver electrical energy. The ions can no longer move efficiently between the electrodes, so the battery can't produce the energy needed to power a device. The battery might still have lithium ions, but they can't move in a way that's useful.
Thank you very much from the UK, I was skeptical about the battery fix but I had a second battery that has never worked in over four years. Did your wire trip to spare battery charged and now fully functioning. Many thanks.
This works 100percent ! Thank you so much for sharing ! My batteyr was dead and didnt want to charge. I didnt have a spare battery so I stripped the battery and hardwired the positive and negative terminals directly to the charger for 10mins. Tested it and worked first time. Closed up the battery and now charging it normally via the charger. Super helpful thanks again !
This worked greatly! Thank You so much! My drill battery has been dead for years and now it’s working again. I’m so glad I had my friends dad’s drill with me to do this. But could you do a video where if I didn’t have my friends dad’s drill how to fix the drill battery without a second drill battery, please and thank you.
Note he's letting a lot of current flow to the flat battery. There's no resistor in the circuit. This could damage a battery or maybe make the wires hot depending on what you use. Just do it for a second or two, don't walk away.
X2 and I sure as heck would be keeping those in a steel box for storage after that. When they see how much a single AA lithium battery can light up from overcharging, or force charging a bad cell......it changes a person....lol
All he is doing in ti's video is connecting the 2 batteries in parallel. It's no different than jump starting a car. The charged battery connecting to the dead battery is no different than a charger in this case. Remember, something tells the charger not to charge because the battery voltage is to low to charge. Using a charged battery to give a little charge to the unchangeable battery bypasses this don't charge signal and raises the voltage If the battery is damaged internally, this trick won't work.
My friend came round today with his Bergman 18v 'dead' battery,-he couldn't get a new one anywhere,-so we tried your trick today using my Bosch 18v battery. It worked a treat,-so thanks a lot for this video!
Just saw your video,so I ran downstairs into my garage and I tried your trick? HAPPY TO SAY IT WORKS!!! I left the spare battery charging right now. Thank you for this great video you saved me money and you know this batteries are not cheep, so thank you very much!! I’m subscribing and like your video
Can't believe that this worked. Purchased two new batterys on line one charged up fine second one showed BAD battery on charger. Found this vidio and this set the battery up to take a charge Fantastic Thanks for passing on the information.
OMG! This totally worked for my Craftsman 19.2V C3 battery. It was measuring 15V internally but was dead between plus (pin at top/curve side) and minus (pin at bottom/flat side). I jumped it with a good C3 battery (just like jumping a car) and it was recognized by the charger and is charging. You saved me from having to buy another battery. Thank you!
I have a Craftsman 19.2 batteries also. They haven't gotten to the point of being completely dead, but when I charge them, they die out very quickly. Is there a repair solution for this or should I go and buy replacements? Thank you.
@@dougbergren8035 Not sure, but if they're not keeping a charge for long, it sounds like they might be ready to replace. But if you have a good battery, and one that is not getting any charge, the jumpstart method using the pins above might help improve the memory. Worst case, you have to get a new battery. Good luck!
@@dougbergren8035battery capacity does fade over time, but within a reasonable time scale not so much that they very very quickly run out. What this sounds like is the individual cells have drifted out of balance with each other. One or a pair of cells are nearly empty when the others are Full or even over-full. It might be possible to open the pack and jump the lower voltage cells up. But is a potentially risky business. Those cells may be chemistry damaged so their internal resistance is higher. Meaning they will only drift apart again fairly quickly. Probably best to just get a new pack or entirely new tool.
Great tip. I haven't used this on power tool batteries, but similarly I've found that on car batteries, the newer chargers with all the sensors can have the same problem with very low batteries. So have yourself an older style car battery charger that will push charge Into it. Then you can use any charger after that.
Hi I just did this to three of my battery and presto two of them worked but saved me a fortune on new ones many thanks I will be telling others to look at your video and like it THANK YOU
tried it . . . it WORKED!!!!!!!! The DeWalt 20V would not turn on the charger, but after I followed the directions in this video, it charged and charged fully!! This video is worth its weight in gold.
That trick worked! Thanks so very, very much!! I had a newer DeWalt powerstack battery, and a slightly older 2AH Dewalt battery the both "died" while on a battery converter that I purchased to be able to use my 20 volt Dewalt batteries on my new Milwaukee 18 volt 18ga nailer. I am real suspicious that it has the ability to kill batteries.
Most likely, that battery-converter is drawing some current when not in use: probably not a lot, but a few milli-amps are enough to drain a battery in a short amount of time, especially when it's already at 50 % SOC or so when you put it away for next use. I nearly killed one of my newly recelled video-batteries this way when I kept my Blackmagic Video Assist connected to the camera via D-tap. In stand-by, it was drawing 6,5 mA, which I consider absolutely ridiculous in this era: there are many power supply IC's that can do a far better job at stand-by current. 6,5 mA doesn't sound like much for a 170 Wh battery, but at 50 % SOC it took a few weeks or so to get it down to system critical voltage, with the BMS nearly going into shutdown mode. I recelled them myself and have the interface to reset them if I need to (because it takes a looong time for the cells/BMS to go from 'shutdown' to 'shutdown forever' mode , but it's not good for the cells to go that low)
Turns out I needed to charge my Milwaukee M12 a bit more to get over the safety limit for the charger to engage. 8 minutes seems to have done the trick. Thank you!
Thank you so much. Come to use my new battery for the 2nd time and it wouldn't work / charge. Was about to order a new one, was annoyed that i binned the reciept for it so couldn't exchange. Found your video luckily first and did what you said in the video and it is now working again😊
Thanks bro. I have RIDGID tools and one battery did not last me 6 months and because I did not register it ON purchase RIDGID or home depot refused to take it back. I will be trying this the moment I get home. Will let you know if it works.
Holy cow ! This is a great tip. It would have been nice to have known this a couple of years ago before I retired. No telling how many good batteries I tossed and bought new to replace them. I worked my tools hard, so I just figured I pushed them too much.
Was getting worried when my newly refurbed impact drill from Stanley wouldn't charge, this tip worked like a charm, thank you so much for this advice, much appreciated 👍
Well. It worked! I had one B&D Firestorm 18v battery that wouldn’t charge, jumped the terminals from a fully charged battery to the failed one for just a few seconds, then put it in the charger. That was one hour ago, and it shows about 75% and still charging. Nice. Thanks for the tip…
Mine is black n decker,my problem is about the charger,,they said its an old model and not available now in the market,,just bought it 1980 n the tecnichian tried to fix but still not working already been stock for a years now,can you give an advice whether to throw it out or not ,thanks
If your battery is really and truly dead, it still shouldn't go in the garbage / landfill. It's very toxic and should be recycled. Ask your local store if they will handle it, and if they don't, hassle them to add this simple public service. Don't forget schools -- our local public school has a "battery bin" for everything from flashlight cells to tool batteries -- it's amazing how fast ours fills up.
When my battery didn't charge I took it apart and found that one cell had much lower voltage than the others. I charged that cell with a single-cell USB charger, and that fixed it. The cell was still good but somehow the cells became unbalanced.
I attempted this battery-to- battery with a Metabo HPT 36v 4.0 AH and had no luck. The charger indicates that the dead battery is charged, but no battery power bars light up and it cannot power a tool. Awesome video though. You helped a lot of people!
Just tried the wire jump start, had a little spark, but plugged it into charger and it's charging...wow, I'm telling everyone. Thanks so so so much for sharing your knowledge. Cenobia in Austin Texas
I bought a Makeda drill and impact kit 20 years ago. Use them daily for fifteen years, then Built a half mile cedar fence with the drill and 2 thirty by thirty buildings. Never had to replace the batteries and the drill just now wore out. Maybe I just got lucky but either way it's pretty darned amazing 👍
Something similar to this also works really well for Lithium-Ion digital camera batteries. When I find the battery shows zero volts on the voltmeter, and won't charge when I put it on the charger, I use a tiny 6v lead-acid modellers battery and use small leads to hold the + & - terminals of the lead acid battery to the + & - terminals of the Lithium battery for *no more than five seconds* - this will raise the voltage up to give a reading of a few volts. That voltage won't stay there very long, so you must put that battery straight on the charger and it will start charging. This technique is especially useful if you have one of those universal after-market chargers that automatically senses whether the battery is a 3.7v type or a 7.4v type. For those chargers to sense that the battery is a 7.4 volt type, the battery voltage itself has to be least 4½ volts. If its not, it will mistakenly sense the battery as a 3.7 volt type and will never charge it. In order to get it to be correctly sensed by the charger use the same technique as above - it will sense the voltage over 4½ volts and start charging the battery up to its correct voltage.
It’s a good tip but may burn your house down unfortunately. Before you do this you need to take a voltage reading to see where it is sitting at. If it’s only a couple of volts down you will probable be ok. Any more then proceed with extreme caution
@@ronherrin4374 not really ideally you need a battery of the same voltage. You really must measure the voltage of the dead battery and build up gradually using a load such as a headlight build in series. Flashing straight across can be playing with fire literally
Hi. Thanks for this video, you explained it well and it makes a lot of sense. Unfortunately it didn’t work for me. I’m in the UK and I’m using Parkside tools’ X-Team 20V batteries. Specifically the PAP 20 A1 model. Oddly, the charger and the battery both died at the same time. I’ve bought a new charger with a battery and that charger is working fine. However when I try to charge the ‘dead’ battery it says it can’t be charged, as you showed in your video. I tried your suggestion and for about half a minute looked like it would work, but then the error code came back. Tried jumping it yesterday and again today a little bit longer, but nothing. Do you have any ideas? Thanks
I wasn't even searching for this issue but it appeared in my feed for some reason. And shortly after, I found a battery that wasn't charging. I had my doubts, but figured what the hell. Lo and behold, it worked! I won't lie, the spark and slight burning smell when I connected the last contact scared me, but it saved one of my precious DeWalt 20V batteries, so thank you!
Best video for non tool people like me! I hate batteries pretending to be dead so I have to buy more... and I hate tossing them. You saved me and the planet! Thanks, Flannel Guy1
NOTE - LONG TERM Storage of the battery in the TOOL will slowly micro DRAIN the current and ruin the battery - it will take months - so DO NOT keep the battery stored in the tool
I would be very careful with this. Lithium batteries don’t handle short circuits well, both the full and empty batteries are at risk of overheating and catching fire. Instead of a simple wire to jump the batteries, use a low value resistor such as a car light bulb in series between the two positive contacts.
A short would be if the connection was + to - of one to the other but the connection used was a jump same as you'd do with a flat car battery to another one. This is to provide enough charge so the flat one can show a sign of life to the charger. Most Li chargers expect some voltage to show before they will charge a battery and that is what this method aims to provide.
@@Rybagz hmmm… how do you know the empty battery isn’t internally shorted? This can happen when left empty for too long, or if overcharged. Look up dendrite formation in lithium cells.
As I understand it, lithium ion batteries has no memory effect, this is only to get the small computer in the battery to have some power to talk to the charger. If short circuit lithium ion batteries, this is very dangerous. Most electronics are safe today, and many batteries are not directly connected to the using device, but has a controller with very low Ri in it, to have controll over the discharge and short circuits. This is the reason why NiMh was shifted out of use by all these manufacturers years ago.
@@jameswik212 i rebuilt power tool lithium batteries. On those I worked on there was a direct connection between the cells and battery terminals. Maybe higher end units have mosfets but I have yet to see any.
@@jameswik212 This is also why if you completely kill something with a non-replacable battery (like your cellphone), it will often charge very very slowly for a while before it turns on enough to charge at the normal speed. It has to be charged enough that the charger can measure the voltage, and if it can't, the charger will just barely trickle-charge it until it can.
for a few weeks now my Worx robot lawn mower has no longer been charging the batteries, thanks to your tip now the battery is recharging and the robot lawn mower is working again, thank you for this tip.
![RYOBI 18V Battery Not Working? [Easy DIY Charging Hack]](http://i.ytimg.com/vi/sqeiOkSNRsU/mqdefault.jpg)
![RYOBI 18V Battery Not Working? [Easy DIY Charging Hack]](/img/tr.png)
Here is a replacement battery if needed amzn.to/3voqOCJ
anyideas on getting a 20v 6.0amp an hr battery to charge it has some life but wont full charge
@@davidsesona4156p
I just did this to 3 dead Dewalt batteries, and it freaking worked!!!!!! Thank you so much.
I am glad that it worked for you. Please share the video on your social networks
Just looked at your video a few minutes ago and with all the concerns I had in mind about a possible fire I took my two batteries outside to do it. Like magic it really works. Thanks! You saved me a bundle. I live in the Caribbean ordering a lithium battery online means shipping to Miami first and then paying air freight to my island then pay customs. A forty dollar battery means $108 in my currency (East Caribbean Dollar). Shipping it is about $35 in our money then customs on a good day will charge 40% around $57 for the importation costing me around EC200. Thank goodness I found this video and thank heavens you shared the info. Thanks again.
Lithium batteries are not designed to be used beyond a low threshold of power, usually nothing less than 40% or so, and in most cases the internal circuit board is the charging monitor and it is designed to shut off at a specific point to not allow a lower level of discharge. If a battery sits long enough it will self discharge below this level. Jumping the dead battery charges the capacitor on the monitoring circuit, allowing it to believe it has the lower limit and it adjusts to allow charging. I use an 18 GA wire with a bent loop at the end to plug into contacts lie this in order to not spread the contacts too far. This is a good video, Thank you for posting.
I have a ryobi battery. How do I make that work
@@jedrekdennis8951ml
@@jedrekdennis8951
Mom
I have a Craftsman 19.2 battery. I bought a charger for it. But I have no way to jump-started except off my Dewalt batteries. What should I do and how do I do it
Thanks, friend. I ruined my Ryobi 18v model P102 by leaving it in charger but in my frozen garage over winter, now dead. Don't have a mate to jump start but do have a B&D 18v p pack. Worth a shot with this method?
Hey man thanks! We are having a snowstorm and I got out my Snow Joe snowblower. I found 3 out of 4 batteries dead. They cost $200 apiece! I tried your fix and it brought all of them back to life! Excellent!!!
So.... That worked like a charm!! I watched the clip earlier, gave you the like before I tried it I was that confident. Worked so well I had to return and comment. So for all those who've done this and it worked, Thank you!
What a brilliant tip !! I had a battery that I thought was dead and had put it to one side for when we went to a battery collection place. I saw this tip and gave it a go.....WOW !! Just gave it a one second jump and tried it in the charger and hey presto, battery now charging. Thank you so much for sharing this with us.
Question: How good is your batteries now? I mean after your success, is it still working good now? I just threw away one death Makita battery two weeks ago. If I watched this video before, I tried to do it like you. Thanks
I probably threw away a Craftsman drill battery that could of been saved a few years ago. I know now. Thank you.
@@VidTubeWatchprobably saved yourself from a ion fire and burned down the house.
They are designed to stop working for a very good reason.
Kaboom!
Hi does this work on batt that no longer fully charges ie 2 out of 3 light s when charged
Also a one off , can it charge of f another same size batt
Thx Joe
@joebalkovics3322 It does work. It's really for a battery that won't charge at all. Try to jump off with a good battery of the same kind. Just follow the directions in the video. If the battery is totally shot or dead, then probably not. A battery that will not fully charge as you described is on its way out.
I’ve just done what he showed me and it’s worked. Not used the battery for nearly 2 years as I thought it was totally gone. It’s now charging. Thankyou very much.
Pls report back on how much work can the revived battery do. I try to store lithium batteries around 20-30% full but sometimes they bleed out their juice before the next top-up.
Same here mate 3 years and charging fully
You will have to rejump them quite soon
just remember that this will charge, but your capacity is crippled unless you replace the dead cell that caused it not to charge in the first place.
Have a Harbor-Freight 20v 5 ah battery that went dead from lack of use / charging (only used it once in the past two years)...charger lights would only flash...Didn't want to hunt down some solid wire...so I used 4 "t-pins" from my local fabric store inserted into the battery slots...(picked that idea up from the South Main Auto channel) and a pair of alligator jumper wires...got a spark upon touching the negative t-pin...so i sparked it again...immediately put the battery on the charger...IT IS NOW CHARGING!!!! In the words of Elvis: "Thankyouverymuccchh!"
thank you for watching - please share the video
Straight up worked. Used 20v DeWalt to awaken 20v Bosch for about 3 seconds. Charger blinking now! Ty.
I used to design lithium battery charging circuits. To extend battery life.... 1. Let battery rest after use before charging. 2. Wait after charging before using. 3. Don't store fully charged or highly discharged. 4. Stay within 10% charged and 90% charged as much as possible. If this nice trick of this video doen't work then most likely still only 1 of the 5 batteries is dead and 4 are usually still as good as new. (20 volts is 5 batteries in series). Just replace the 1 dead battery.
I don’t have wires with the clip in the end. Is there a way to do this using copper wires? Thanks for your advice, this is all new to me.
THANK YOU SOOOOO MUCH!
Had two new Black & Decker batteries that had been left too long without use and the charger would just flash red errors and do nothing.
This worked INSTANTLY! They're now charging green!
Did you have a third battery that was good?
Thank you for this video! I have 40v Ryobi tools and one of the batteries suddenly would not take a charge. I decided to try your method, but checked voltage first. The 'dead' one was showing less than 2v. When I jumped a good battery to the dead one, I got a spark when connecting the negative terminal, but only once. I checked the voltage again and that battery was almost up to 40 volts. I put it in the charger and it immediately started charging. Saved me $100+ for a genuine Ryobi replacement ($60+ for a knockoff).
knockoffs ? or refurbished?
Hopefully he will explain how to recharge a Panasonic battery please
Glad to see this comment. I have a 40v kobalt I want to try this on. Per another comment I’m waiting till I have one of my other 40v batteries to be at about half charge since fully charged ones may not work for the jump.
I was told that putting a dead battery in the freezer overnight is another way to rejuvenate it. Has anyone tried this or have a comment?
Thank you for this. I had a 20v max DeWalt battery that has been non responsive for over 6 months now. I followed your steps and 'boom', back to life. I'm glad I didn't discard it!
I had two six amp hour DeWalt 20 volt batteries that I was ready to toss I did this and they are now taking a charge unbelievable! This really works I was skeptical but you just saved me from having to replace two six amp hour batteries! Thank you so much!
Thank you so much for posting this video. I have a simple question: Why doesn't the charger work while the jumping works? Doesn't charging mean equally jumping? Your method has not yet been tried on my four dead batteries, but I will this weekend, and I am so excited!
I explained that in the very beginning.
Worked like a charm on a cheap Chinese 21v battery for a handheld saw. Arrived from amazon seemingly dead. Saw a few little sparks when connecting the last negative wire. Thought that might have caused a problem, but it didn't. Thing charged right up and works perfectly now. Thanks a lot.
I had the same few sparks then charged up to fully functioning spare battery
I have used this technique for 8v golf cart batteries. I boosted each battery with a 12v charger for a few minutes, then wired the batteries (6) in series for a total of 48V. The charger for the golf cart is "smart" and needs to see a minimum voltage to start charging. Thank you for providing this method for tool batteries, I would have never thought to do this.
6 that’s a ton of money for golf cart batteries
Worked for my 18 volt lithium. Went from 2.3v measured to full charge 18v. Held the wires for about 15 seconds. Thank you!
I bought a Hart drill combo and the battery that came with it NEVER worked.......well...... until I watched your video and used your technique. Flawless!! Thank you, sir
It's just amazing..... it works perfectly, I was sad because I thought I had to buy a new battery and with this hack the smile came back to my face.🎉🎉
Thanks for watching Jaime.. please share the video on your social networks
The same problem happens with normal 12 car battery chargers, they have to see a certain voltage coming back from the battery to check polarity before starting a charge cycle, it is also a part of the 'anti-spark' and short circuit proofing that if you connect the clips together the charger will not pass any power. Sometimes to charge a battery you need to connect a 'good' battery in parallel to start the charge and after 10 minutes take the good battery away and the charger will happily carry on.
@jygb7092 Only if you belong to a certain group of people....
This is a great idea provided you Have 2 batteries and one is in good condition! Usually my situation is the battery will indicate charged, but only last a few minutes.
thanks for watching
Saw this 2 years ago when you first posted it. Worked great! You've saved me over $1,200 in batteries! Where do I send your $600? :). Hey! Seriously! Thanks a million buddy! Take care! North Florida here!
Just done this. Dremel battery wouldn’t charge, looking to buy a new one (not cheap) came across this video and gave it a go. It worked battery now fully charged. Thank you.
Thank you for watching !
Thank you from the UK, something i had never thought of, had two dead 1.5 mah B and D batteries, jump started from a 2.5 mah Power Exchange without issue, saved me buying yet another drill.
An incredibly useful tip. My son returned a totally exhausted Bosch hedge trimmer. I was about to toss the dead battery but tried this hack. It worked beautifully and has saved me at least £60. Thankyou!
Fan-TASTIC video. Who would believe that it's so simple to fix? The explanation makes perfect sense - without even the tiny amount of charge needed to send signal to charger that all's O.K. to recharge - it wont!
This must save so many people (including myself) so much time and money. Many thanks for posting.
thanks for watching. Please share the video!
You misunderstood this, the charger is specifically designed to refuse charging a fully depleted pack, not even with a tiny current. A lithium Ion cell might be internally damaged if it is fully depleted in such a way that once it's fully charged agan (no matter how slowly) it can get internally shorted and bust into flames. Even a small cellphone battery might be enough to burn your house down. Some years ago I also thought I was very smart when doing this. I might still do it if I have to, it will work, but I would discard it as soon as possible after in a safe way.
@xehpuk Are u saying they're resistant to recharging in the first place because they are internally damaged?
@@rcristy It will charge for sure but it shouldn't be. In worst case a damaged li-ion cell might ignite fire.
@@xehpuk 🙏
U the man I'm sitting in home depot and about to go buy new batteries and it worked u just saved me a good bit of money thank God for UA-cam
I have a 15-year-old Hitachi drill and one of the batteries wouldn't charge. I did your trick, took five minutes, and worked like a charm. Thanks, bro!
I am glad it worked
*WELL DONE!!* As a some-time Home Depot hardware guy, it would so bum me out when DeWalt guys would come in with DOA batteries. This little hack will get a number of 'em back in business, and (as a retired economist) leave me with much happier customers. *THANKS.*
Wow. Just tried this on my small lithium flashlight batteries and it also worked. Thank you.
Literally the most useful UA-cam video ever!!! Thank you sir!
What gauge wire do I need to charge the batteries? I have the exact ones you demonstrated first. They are ok for now, but I’ve had to get rid of two sets now. I’m so happy to see everyone commenting that this hack works. Thankyou! 👍🏻
Any wire that's not to thin but will fit in the contact's, you only need to do it for a couple of seconds.
But if it's a worn battery it'll not work, but if it's a couple of years old and only been charged less than a dozen times you should be good to go
Hey, I had the exact same battery that you recharged, and it worked like a charm. Battery would not come alive with no light in the charger, just like yours. After your B+, B - wire trick, charger light started blinking and Batt was fully charged in one and half hrs. Thanks a bunch!!!!!!
ABSOLUTELY happy to like your video. Thanks so much for sharing this. Wiring the batteries in parallel is a great tip to transfer just enough power to trick the charger. I had an old mobile phone battery that would not do anything and after putting it on and off the charger many times with zero life I put it in one last time and then it initiated the charger and charged and it's been fine ever since. But you're video jogged my memory so I can't wait to try your idea on my DeWalt 18 volt batteries that are lifeless through lack of use. I love my cordless tools but whenever you need a tool without fail it's always the Old Faithful corded tool that never fails. Cheers again.
Thank you! It’s crazy how much $$ these new batteries are! This happened to me years ago before I had seen this trick, and ended up buying a whole new tool bc it was just as much as buying new batteries!
Tank you for this tip. In the case I have only one battery to backup do you have any solution? Thanks
Yeap, left testicle to B minus and so on
I just tried it with baling wire and a 9 volt battery. I was so surprised it worked!
Tried this today and it fixed a battery that I let run dead. Thanks for the video.
Thank you,
I bought a set and one battery never would charge, it’s been a few years.
Your trick worked like a champ, thought I had nothing to lose.
I’m back with 2 batteries working great.
You just saved me $20. Thanks Dude. Only took a few seconds on my 20V lithium. Liked....
Oi vay...... thats how to do business today..... pull this comment down, dont let the goyim know how to save money !!!!!!
No way..they say you learn something new every day..Thankyou so much for sharing that with us..Have an awesome day & Take care,xx
Holy smokes, where did you learn to do that? This will definitely be helpful for me, thank you so much.
thanks for watching
I did not beleive this would work but! It Worked!!!!!!!!!!!! Amasing!
Thank you very much sir.
Is it normal that this shall get done every time with the old battery? I mean... the old battery which did not worked, did work after I did as you show , charged it, paced in on the tool and the tool worked perfectly. When I tried to recharge the old battery, the same happened as before , it could not charge and I had to make a new reboot.
You help a lot good folks out there and you help this entire planet becasue recyckling and fixing stuff is always better than throwing a way! 👍
I never realized this about Lithium batteries and/or charging stations. I have a collection of older tools that I replaced because I did did not want to spend a fortune on a new battery just to have it fail. I 'm going to go back and make sure I try this. Thanks so much for bring this to light. The tool industry knows this too but they want to sell warrantees. Your the Man.
thank you for watching. please share the video
It's a good trick and thanks for the sharing but before you do this, it's necessary to know a little about how these batteries work in the first place. In a charged lithium-ion battery, lithium ions move from the negative electrode (made of a lithium compound) through an electrolyte to the positive electrode (commonly composed of a material like lithium cobalt oxide) when the battery is being discharged (i.e., when it's powering something). When the battery is being recharged, the opposite happens; the lithium ions move back to the negative electrode.
Over time, several factors can cause a lithium-ion battery to lose its ability to hold a charge:
Cycling: Each time a battery is discharged and recharged, it goes through a "cycle." Over many cycles, the battery's capacity (how much charge it can hold) decreases. This is in part due to the wear and tear on the electrodes from the physical movement of ions. As the ions embed and unembed during each cycle, they can cause structural damage to the electrodes.
Solid Electrolyte Interface (SEI) layer: This is a layer that forms on the electrode's surface as the battery is used. The SEI layer is both beneficial and detrimental; it protects the electrolyte from further decomposition but also increases the internal resistance of the battery and reduces the cell's capacity. Over time, continued growth of the SEI layer can lead to significant capacity loss.
Lithium Plating: When a battery is charged too quickly or at a low temperature, lithium ions may not have enough time to embed themselves back into the negative electrode. This can cause lithium to deposit as a metal on the electrode's surface, a process known as "lithium plating." Once this happens, those lithium ions are no longer available for charge/discharge cycles, reducing the battery's capacity.
Electrolyte Decomposition: The electrolyte inside the battery can decompose due to high temperatures or overcharging, which can lead to gas formation. This can cause the battery to swell and potentially fail.
When a lithium-ion battery "dies," it means that enough of these processes have occurred that the battery can no longer effectively store and deliver electrical energy. The ions can no longer move efficiently between the electrodes, so the battery can't produce the energy needed to power a device. The battery might still have lithium ions, but they can't move in a way that's useful.
Very informative, thanks buddy
@@se-akworkplace3166 Thank you!
what?
We followed your instructions with the wires. Thank You it worked. Wouldn't have known this if we hadn't seen your video
.
Thank you very much from the UK, I was skeptical about the battery fix but I had a second battery that has never worked in over four years. Did your wire trip to spare battery charged and now fully functioning. Many thanks.
This works 100percent ! Thank you so much for sharing ! My batteyr was dead and didnt want to charge. I didnt have a spare battery so I stripped the battery and hardwired the positive and negative terminals directly to the charger for 10mins. Tested it and worked first time. Closed up the battery and now charging it normally via the charger. Super helpful thanks again !
This worked greatly! Thank You so much! My drill battery has been dead for years and now it’s working again. I’m so glad I had my friends dad’s drill with me to do this. But could you do a video where if I didn’t have my friends dad’s drill how to fix the drill battery without a second drill battery, please and thank you.
thank you ..please share the video for me
Note he's letting a lot of current flow to the flat battery. There's no resistor in the circuit. This could damage a battery or maybe make the wires hot depending on what you use. Just do it for a second or two, don't walk away.
X2 and I sure as heck would be keeping those in a steel box for storage after that. When they see how much a single AA lithium battery can light up from overcharging, or force charging a bad cell......it changes a person....lol
All he is doing in ti's video is connecting the 2 batteries in parallel. It's no different than jump starting a car.
The charged battery connecting to the dead battery is no different than a charger in this case. Remember, something tells the charger not to charge because the battery voltage is to low to charge. Using a charged battery to give a little charge to the unchangeable battery bypasses this don't charge signal and raises the voltage
If the battery is damaged internally, this trick won't work.
FROM AUSTRALIA.....I WILL TRY THAT HAVE ABOUT 14 BATTERIES WITH NO ABLE TO CHARGE......NOW I FIND OUT AFTER I BUY SO MANY MORE.....THANKS
My friend came round today with his Bergman 18v 'dead' battery,-he couldn't get a new one anywhere,-so we tried your trick today using my Bosch 18v battery. It worked a treat,-so thanks a lot for this video!
I've got a Ridgid that was brand new, left it.on my radio and it hasn't worked since... this didn't work for me, any ideas?
That's an outstanding trick! Wish I had know this years ago before I tossed all my older batteries.
thank you for watching. please share the video
Me too thank you
Just saw your video,so I ran downstairs into my garage and I tried your trick? HAPPY TO SAY IT WORKS!!! I left the spare battery charging right now. Thank you for this great video you saved me money and you know this batteries are not cheep, so thank you very much!! I’m subscribing and like your video
glad it worked for you. please share the video
Can't believe that this worked. Purchased two new batterys on line one charged up fine second one showed BAD battery on charger. Found this vidio and this set the battery up to take a charge Fantastic Thanks for passing on the information.
never doubt me !!! lol... glad it worked for you. please share the video
OMG! This totally worked for my Craftsman 19.2V C3 battery. It was measuring 15V internally but was dead between plus (pin at top/curve side) and minus (pin at bottom/flat side). I jumped it with a good C3 battery (just like jumping a car) and it was recognized by the charger and is charging. You saved me from having to buy another battery. Thank you!
thanks for watching! please share the video for me
I have a Craftsman 19.2 batteries also. They haven't gotten to the point of being completely dead, but when I charge them, they die out very quickly. Is there a repair solution for this or should I go and buy replacements? Thank you.
@@dougbergren8035 Not sure, but if they're not keeping a charge for long, it sounds like they might be ready to replace. But if you have a good battery, and one that is not getting any charge, the jumpstart method using the pins above might help improve the memory. Worst case, you have to get a new battery. Good luck!
@@dougbergren8035battery capacity does fade over time, but within a reasonable time scale not so much that they very very quickly run out.
What this sounds like is the individual cells have drifted out of balance with each other. One or a pair of cells are nearly empty when the others are Full or even over-full.
It might be possible to open the pack and jump the lower voltage cells up. But is a potentially risky business. Those cells may be chemistry damaged so their internal resistance is higher. Meaning they will only drift apart again fairly quickly.
Probably best to just get a new pack or entirely new tool.
@@johnrhodes3350what this sounds like is lots of talking yet saying nothing.
Great tip. I haven't used this on power tool batteries, but similarly I've found that on car batteries, the newer chargers with all the sensors can have the same problem with very low batteries. So have yourself an older style car battery charger that will push charge Into it. Then you can use any charger after that.
Or just connect another car battery same voltage to it, leave for a few minutes and disconnect
@@adrinathegreat3095 because you usually got stuck buying the digital "smart charger" because of the lack of options for old-school mechanical dials
Anything that mitigates waste in my book is a good thing and you're a star.
Hi I just did this to three of my battery and presto two of them worked but saved me a fortune on new ones many thanks I will be telling others to look at your video and like it THANK YOU
Glad it helped
tried it . . . it WORKED!!!!!!!! The DeWalt 20V would not turn on the charger, but after I followed the directions in this video, it charged and charged fully!! This video is worth its weight in gold.
This revived my 14v DeWalt battery. Thank you.
Good to hear it worked.
That trick worked! Thanks so very, very much!! I had a newer DeWalt powerstack battery, and a slightly older 2AH Dewalt battery the both "died" while on a battery converter that I purchased to be able to use my 20 volt Dewalt batteries on my new Milwaukee 18 volt 18ga nailer. I am real suspicious that it has the ability to kill batteries.
thanks for watching.... and I would appreciate you sharing the video in your social networks.
Most likely, that battery-converter is drawing some current when not in use: probably not a lot, but a few milli-amps are enough to drain a battery in a short amount of time, especially when it's already at 50 % SOC or so when you put it away for next use.
I nearly killed one of my newly recelled video-batteries this way when I kept my Blackmagic Video Assist connected to the camera via D-tap. In stand-by, it was drawing 6,5 mA, which I consider absolutely ridiculous in this era: there are many power supply IC's that can do a far better job at stand-by current. 6,5 mA doesn't sound like much for a 170 Wh battery, but at 50 % SOC it took a few weeks or so to get it down to system critical voltage, with the BMS nearly going into shutdown mode. I recelled them myself and have the interface to reset them if I need to (because it takes a looong time for the cells/BMS to go from 'shutdown' to 'shutdown forever' mode , but it's not good for the cells to go that low)
Turns out I needed to charge my Milwaukee M12 a bit more to get over the safety limit for the charger to engage. 8 minutes seems to have done the trick. Thank you!
Thank you so much. Come to use my new battery for the 2nd time and it wouldn't work / charge. Was about to order a new one, was annoyed that i binned the reciept for it so couldn't exchange. Found your video luckily first and did what you said in the video and it is now working again😊
The same applies to many portable appliances where you need the external switching signal to start up the charging circuit.Great job.
Thanks for sharing
It worked great - I found it worked easier if you flatten the ends of the wire before inserting
into the battery terminal
Great idea! So simple… But effective
Worked like a champ. Can use pennies in the slots and then use clipped wire leads. Thx!!
Good idea
Thank you! It worked. My Dad would have been thrilled to know I did this! I am so excited!
Pam, thank you for watching. please like the video and sub for me
Thanks bro. I have RIDGID tools and one battery did not last me 6 months and because I did not register it ON purchase RIDGID or home depot refused to take it back. I will be trying this the moment I get home. Will let you know if it works.
thanks for watching! please share the video
Holy cow ! This is a great tip. It would have been nice to have known this a couple of years ago before I retired. No telling how many good batteries I tossed and bought new to replace them. I worked my tools hard, so I just figured I pushed them too much.
This works well on NiCD and Lithium-Ion tool batteries. Not quite so much on a deep discharged lead-acid battery.
Was getting worried when my newly refurbed impact drill from Stanley wouldn't charge, this tip worked like a charm, thank you so much for this advice, much appreciated 👍
I do have this going with one of mine for 6 months. Glad I didn't throw it away. I'll give it a try today! Thanks
Good info, I have also the problem of older batteries that will not last or have become very week, any fixes for these?? Wilber
if the battery does not hold the charge, then it likely needs to be replaced
Well. It worked! I had one B&D Firestorm 18v battery that wouldn’t charge, jumped the terminals from a fully charged battery to the failed one for just a few seconds, then put it in the charger. That was one hour ago, and it shows about 75% and still charging. Nice. Thanks for the tip…
I am glad it worked for you too. please share the video for me
Mine is black n decker,my problem is about the charger,,they said its an old model and not available now in the market,,just bought it 1980 n the tecnichian tried to fix but still not working already been stock for a years now,can you give an advice whether to throw it out or not ,thanks
Great tip that worked perfectly! Saved me the cost of a very expensive drone battery! Thank you!
Glad it helped....now you can help me by sharing this video on Facebook
What about E-Bike battery'$ ?@@flannelguydiy6458
If your battery is really and truly dead, it still shouldn't go in the garbage / landfill. It's very toxic and should be recycled. Ask your local store if they will handle it, and if they don't, hassle them to add this simple public service. Don't forget schools -- our local public school has a "battery bin" for everything from flashlight cells to tool batteries -- it's amazing how fast ours fills up.
When my battery didn't charge I took it apart and found that one cell had much lower voltage than the others. I charged that cell with a single-cell USB charger, and that fixed it. The cell was still good but somehow the cells became unbalanced.
I attempted this battery-to- battery with a Metabo HPT 36v 4.0 AH and had no luck. The charger indicates that the dead battery is charged, but no battery power bars light up and it cannot power a tool. Awesome video though. You helped a lot of people!
I've got a few batteries that won't charge and appear dead. I'm looking forward to trying this fix. Thanks very much!
thank you for watching. please share the video
Very useful! Thank you for sharing this. I have a bunch of DeWalt tools and will most likely need this at some point.
😢🎉
So easy when you are shown how!....brilliant!...👍🏻
IT WORKED GR8! YOU JUST SAVED ME $150.00 THANK YOU AND HAVE A BLESSED DAY.
thanks for watching! please share the video
Just tried the wire jump start, had a little spark, but plugged it into charger and it's charging...wow, I'm telling everyone. Thanks so so so much for sharing your knowledge. Cenobia in Austin Texas
thank you for watching. please share the video
I bought a Makeda drill and impact kit 20 years ago. Use them daily for fifteen years, then Built a half mile cedar fence with the drill and 2 thirty by thirty buildings. Never had to replace the batteries and the drill just now wore out. Maybe I just got lucky but either way it's pretty darned amazing 👍
WOW, THANK YOU!!! I was about to throw my drill and buy a new one, thanks for sharing your video....
Been and done it mate works brilliantly , good on you for sharing it 😊
Something similar to this also works really well for Lithium-Ion digital camera batteries. When I find the battery shows zero volts on the voltmeter, and won't charge when I put it on the charger, I use a tiny 6v lead-acid modellers battery and use small leads to hold the + & - terminals of the lead acid battery to the + & - terminals of the Lithium battery for *no more than five seconds* - this will raise the voltage up to give a reading of a few volts. That voltage won't stay there very long, so you must put that battery straight on the charger and it will start charging.
This technique is especially useful if you have one of those universal after-market chargers that automatically senses whether the battery is a 3.7v type or a 7.4v type. For those chargers to sense that the battery is a 7.4 volt type, the battery voltage itself has to be least 4½ volts. If its not, it will mistakenly sense the battery as a 3.7 volt type and will never charge it. In order to get it to be correctly sensed by the charger use the same technique as above - it will sense the voltage over 4½ volts and start charging the battery up to its correct voltage.
I tried connecting + to +an - to - I get sparks like it’s wrong polarity. 9.0 to 5ah. 9 battery is dead
Brilliant tip - thanks for this - I just used it to successfully “jump start” a 20V Li-ion battery for a Worx pressure washer. That saved me a few ££!
Glad it helped
I did this technique but with a power supply and also worked. (Verify voltage before). Thank youu!
It’s a good tip but may burn your house down unfortunately. Before you do this you need to take a voltage reading to see where it is sitting at. If it’s only a couple of volts down you will probable be ok. Any more then proceed with extreme caution
Any way to do this if you don't have an extra battery?
@@ronherrin4374 not really ideally you need a battery of the same voltage. You really must measure the voltage of the dead battery and build up gradually using a load such as a headlight build in series. Flashing straight across can be playing with fire literally
Hi.
Thanks for this video, you explained it well and it makes a lot of sense. Unfortunately it didn’t work for me.
I’m in the UK and I’m using Parkside tools’ X-Team 20V batteries. Specifically the PAP 20 A1 model. Oddly, the charger and the battery both died at the same time. I’ve bought a new charger with a battery and that charger is working fine. However when I try to charge the ‘dead’ battery it says it can’t be charged, as you showed in your video. I tried your suggestion and for about half a minute looked like it would work, but then the error code came back. Tried jumping it yesterday and again today a little bit longer, but nothing.
Do you have any ideas?
Thanks
Internal damage maybe? Did you try the new battery in the old charger?
. Yeah here's an idea.... All of these videos are bullshit! All of these comments are bullshit.... None of this is real.
Very cool! One thing: you said "toss them in the garbage" these batteries need to be recycled - not thrown in the trash.
He was just using a figure of speech. The video was not about recycling. Take a break 😂
@@billwilson6096 If it was just a "figure of speech" it was an irresponsible one. Take a hike.
I wasn't even searching for this issue but it appeared in my feed for some reason. And shortly after, I found a battery that wasn't charging. I had my doubts, but figured what the hell. Lo and behold, it worked!
I won't lie, the spark and slight burning smell when I connected the last contact scared me, but it saved one of my precious DeWalt 20V batteries, so thank you!
Best video for non tool people like me! I hate batteries pretending to be dead so I have to buy more... and I hate tossing them. You saved me and the planet! Thanks, Flannel Guy1
NOTE - LONG TERM Storage of the battery in the TOOL will slowly micro DRAIN the current and ruin the battery - it will take months - so DO NOT keep the battery stored in the tool
Maybe simply tap the end of the wire with a hammer to create a tapered end and it will easily push into the terminals
I would be very careful with this. Lithium batteries don’t handle short circuits well, both the full and empty batteries are at risk of overheating and catching fire.
Instead of a simple wire to jump the batteries, use a low value resistor such as a car light bulb in series between the two positive contacts.
A short would be if the connection was + to - of one to the other but the connection used was a jump same as you'd do with a flat car battery to another one. This is to provide enough charge so the flat one can show a sign of life to the charger. Most Li chargers expect some voltage to show before they will charge a battery and that is what this method aims to provide.
@@Rybagz hmmm… how do you know the empty battery isn’t internally shorted? This can happen when left empty for too long, or if overcharged. Look up dendrite formation in lithium cells.
As I understand it, lithium ion batteries has no memory effect, this is only to get the small computer in the battery to have some power to talk to the charger. If short circuit lithium ion batteries, this is very dangerous. Most electronics are safe today, and many batteries are not directly connected to the using device, but has a controller with very low Ri in it, to have controll over the discharge and short circuits. This is the reason why NiMh was shifted out of use by all these manufacturers years ago.
@@jameswik212 i rebuilt power tool lithium batteries. On those I worked on there was a direct connection between the cells and battery terminals.
Maybe higher end units have mosfets but I have yet to see any.
@@jameswik212 This is also why if you completely kill something with a non-replacable battery (like your cellphone), it will often charge very very slowly for a while before it turns on enough to charge at the normal speed. It has to be charged enough that the charger can measure the voltage, and if it can't, the charger will just barely trickle-charge it until it can.
for a few weeks now my Worx robot lawn mower has no longer been charging the batteries, thanks to your tip now the battery is recharging and the robot lawn mower is working again, thank you for this tip.
I just got done watching your video I have two different batteries heart and Bauer and it worked they are charging now thank you very much😊
great news ! please share the video for me.. thank you