How to revive a dead Dewalt battery that is not charging
Вставка
- Опубліковано 27 тра 2022
- A procedure to revive a Dewalt battery which I have used successfully.
It may work for you credit goes to Matthew Peech whose channel I saw it on.
How to revive DEWALT Lithium battery?
Not Charging? If jump-start won't work? try manual reset. I will show you how I fix or revive my DEWALT Lithium battery that doesn't charge. If Kick-start or jump-start doesn't work you can try another method. Reset the CID ( current interrupt device). This event can happen to your battery if there is excessive cell pressure,high temperature or high voltage while using your power tool. If this method still don't revive your battery, it might need parts replacement. This is just my experience I want to share, I learned this from other people who shared same information about this matter.
just be careful when working with a battery like this.
The procedure effectively jump starts a battery with depleted cells if the cells are bad it won't work.
If a battery gets drained to a certain low point it can no longer be charged. This is the reason your dewalt battery won't charge. A small power donation corrects this.
Dewalt battery not working?
Dewalt battery not taking charge?
Dewalt battery not holding charge?
Can a dewalt battery be repaired?
this video may help
This will work on Dewalt Xr 18v and Dewalt 20v max batteries a surprisingly high percentage of the time.
#dewalt #repair #battery - Навчання та стиль
Thanks. It worked perfectly for a 12v battery that I hadn't used in a few years.
Excellent!
Great video to help folks out! The same technique works with dead 12v automotive / motorcycle batteries and newer "smart" chargers. You need to get a small amount of juice in the dead battery for the charger to recognize it as viable, and then it will charge, so long as there is not a shorted cell or other internal issues.
Similar technique works in dead cell phones. Won't charge via USB or surge protector? Directly plug in with an adapter to a wall socket. Sometimes they need a higher current to push the dead zone. I don't know why. But it works
This is the best way to get the batteries to charge properly! Top job
It won't work all the time but it has a high success rate
Hey man!! Well I just tried this & geez it worked perfectly. I have several Dewalt batteries (I'm a drywall contractor in SoCal) & the ones that didn't work I wrote a ? on so I could tell them apart from ones that worked. So far they all work now thanks to your help. Much appreciated.
Thanks for watching my video
Thank you so much, I left one of my 8ah batteries in my fan overnight and the next day when I tried to charge it the charger showed it to be defective. I was already shopping for a new one but I figured there had to be a way to get it to charge because this is one of my newest batteries. I tried this for a minute and the battery showed one bar so I stuck it on the charger and it charged right up. Again, thank you for saving me $150 for a new battery 👍
Only too happy to help.It doesn't work every time but always the first thing to try, thanks for your comment
Saved a completely discharged battery of mine. Thanks! 👍
Glad I could help
Thank you so much. I revived 2 dead Dewalt battery
Thanks for your comment
This trick works! I bought a (Chinese knockoff) 18v to 20v adapter so I could use my old 18v Dewalt drills and the adapter flattened the 20v battery to nothing. If put on the charger, the flat battery did nothing. I used this trick and the battery started charging again.
Thanks for your comment 👍 I am glad it helped
THIS WORKED!!!! I had to wire 2 12v batteries in parallel to revive the 20v but now I have the red blinking light!!!
P.S. yes I shocked myself in the process but not too bad.
Awesome
Invest in a bench power supply mate, you can limit the current going in to the battery to a sensible amount, whereas jump starting will dump all of the current of the good battery into the duff one totally uncontrolled - other than watching it with your eyes! I normally start at 1A and then up to 2-4A then if all ok leave it be to take it up to 17V ish then onto the charger and see what happens. If charger wont do it then theres gauranteed one dead cell at least. If you get a cell failed in short circuit which happens occasionally (even though it shouldnt) they get really hot really quick trying to jump them. I've got a Flexvolt in for repair that had caught fire from what looks like a shorted cell. A bench power supply wont send any current in across a dead short. Most of the time this trick is good for the general DIYer but I think you're a step on from that!
Yeah I will have to do that I have seen the battery to battery method fry a cell before. Thanks for the advice that is going to be my next purchase.
Thank you Doctor Left, I have 2 Dewalt 20V batteries that have been dead for over a year. I took one apart and measured the voltage on each battery and all 5 were about 1/2 a volt, 3.2 volts total instead of 20V. I used solid copper 14 gauge wire, stripped a half inch off each end and hammered the ends flat so they would slide into the good and bad battery terminals. I let them sit for 45 seconds, the wires did not heat up. Before I did this the battery charger light wouldn't even come on, after I did the wake-up call, the charger started charging my first battery. It's charged up to 20.4 V and runs my multi tool. Hip hip hooray. December 2022
Glad I could help check out my other videos if you have time. I do the type of basic tool repairs anyone can do with a few basic tools or in this case 2 bits of wire.
damn i need to try that, i got a 20v 2ah battery with a china item and its dead but i have a other item from teccpo that is 18v 4ah and that worked in the item but im curious if i can try and boost the 20v with the 18v battery the 20v battery says 6v.. and i cant find a dead celll they all say 1.2v x5 i have a other battery from a cheap drill that also is dead that has 4 battery 14v and 2 give 3.6v 1 gives 1.2 and one 0...
so i would say i might have a chance....
@@reggiexp69 it is worth a try
@@doctorlefthandthread just did it and it revived the battery, god damn am happy been trying to get a refund for a week know cause of the dead battery and i wanted a new one. atleast i know the item works now
@@reggiexp69 I am glad its always worth a try check out my other videos it helps my channel as do your comments Thank you
Left a pack on a cheap aftermarket usb adapter and forgot about it for a week, would not take a charge. Tried your method, wire got pretty warm so I only left it hooked for about 20 seconds. Put dead pack on charger and it started charging straight away where previously the charger didn’t even act like it had a battery on it! Thanks!🎉
Well cheers pal it worked you saved me €100 thankyou
Thanks for your comment I love that these videos help people
This technique does work and is usually worth trying. However, DeWalt Chargers are programmed not to charge these batteries for a very good reason. Over-discharged li-ion cells are permanently damaged - injecting unlimited current from a fully charged 21V pack to a fully dead 2V pack can turn into a very angry thermal event. I would highly advise using your smallest pack at less than 50% capacity to boost any other pack's voltage. You only need to bring the voltage up to about 15.3V in order for the charger to recognize it, so use a multimeter if at all possible and be ready to pull the packs apart at the first sensation of heat.
I agree with your full comment this video must be 2 years old if using this method now I always monitor the voltage at the same time to not overcook it
@@doctorlefthandthread nice! Yeah in no way am I critiquing the video. I just thought that info could be useful to someone. Fundamentally, the way you did it is likely the safest way to boost the voltage without buying dedicated charging gear.
@@doctorlefthandthread hey also, for the packs you did successfully revive - how have they performed in the following years? Have they lasted?
@@Spaniard47 yes they are still going not in heavy use but still going
@@Spaniard47 thanks for your comments
I purchased some transparent speaker wire. Do I use the copper for positive and the nickel or "silver wire for my negatives? Or do I just use any conductive wires for the paired terminals
Any conductive wire will do as long as you connect + to + and - to - .
However if you are using light wire be careful if the bad battery has very low voltage it can melt the wires. Wear gloves and monitor the situation carefully. If they start to melt take them off the gloves are to avoid burning your hands. If you have a multimeter test the voltage before and after try and get it up to 17v before charging it with the charger.
@@doctorlefthandthread Thanks for the tip. I have a multimeter, just need to grab some spade connectors and give it a try.
Great video, how come this works?!?!? I’m so confused but truly interested in finding out why and how
I think if you let a battery sit in a discharged state too long or discharge it fully. This means the charger can't recognise it as a battery that needs charged but connecting a good battery some of the energy is transferred to the totally flat one then the charger can charge it. If some cells are faulty this will not work. That is my very amateur understanding of it anyway.
@@doctorlefthandthreadVery interesting
No bars under the battery pack and no light when I place on charger. Can I still do this ?
Yes check the voltage if it the jump Start doesn't shift the voltage it could mean bad cells or broken connections
My battery doesn’t even show a light on the charger at all.
Yes check the voltage first
Where does everyone get these sections of spare copper wire and connectors from? Sorry I have no idea about electronics and when I try searching for such products I'm left relatively unsuccessful
Spare wire from a household appliance that is going to be thrown out I usually cut the wire off all things like that before dumping them
@@doctorlefthandthread Appreciate the insight! Any recommendations or guides to follow to efficiently and safely salvage electronics? This is an exciting proposition considering I have half a dozen old laptops that no longer function
@@philhunt1442 I must admit I don't know much about laptops but alot of electronics can be repurposed in some way
@@doctorlefthandthread What are your favorites in general for salvaging?
@@philhunt1442 mainly battery cells casings switches from powertools cable from tools that are beyond repair
I did this trick and the battery was charging, BUT at the end the battery was super *hot* and the next morning had only 1 light on and the morning after was dead again without been in use
In some cases after doing this a cell or 2 can fail I have had this happen too and I replaced the bad cells
What did you use to connect the batteries? Trying to resurrect a 20v.
Thanks!!
Use heavy wire but be careful. Make sure and connect + to + and - to -. If you are connecting from a fully charged battery the wires even if they are heavy can melt so wear gloves and watch for this. Try and bring the voltage above 17v to get it to charge. If it doesn't work you could have bad cells
@@doctorlefthandthread thank you so much for your help with this! It’s successfully on the charger now!
@@mary-rosegranlund7948 that's awesome check out my other videos if you have time. It helps the channel thanks
Anyone tried an RC battery charger to do this?
Obviously a lipo charger. Just curious.
I used a laptop charger once it was rated 19v I have recently acquired a dc power supply to bring them up it's safer