Jumpstart Broken Milwaukee battery 18v
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- Опубліковано 10 лют 2025
- How to jump start a Milwaukee 18v battery.
I’m not condoning this. Do so at your own risk.
Any more idea for how to get this to work, let me know.
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addictedtotools
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#milwaukee #tools #toolreview #m18 #battery #jumpstart
This worked for me. I have an M18 that was showing one bar, would not work in tools but showed charged on the charger. I used this jump method, did not seem to bring the charge up. Put battery it the charger. It was red for a second, switched to green, now the battery is at full charge! Thanks Mate!
It worked!!!! Bro that's a $250 battery you just saved. Thank you!
Awesome!!
I just tried this and it seemed like it didn’t work. Only one flashing bar and got the green light on the charger. After reading one of the comment where about freezing it and hitting the battery to break up the lithium I tried giving it some medium to light taps with my hammer. It worked! My battery seems to be working fine now. Thanks for the tips
Like how hard did you hit them lol jw
I've tried like every one of these tricks for Dewalt 20v and 18 volt with not luck.
I’ve had my Milwaukee charger right out of the box flash green/red so I called them directly & they told me sometimes new batteries go into a “sleep mode”. They simply suggested this upon the initial charge & should work from there on in! Gonna give this a try this weekend!!
Safety tip. Hook negative to negative first. Then positive to positive. Don't do both negative and positive same time on one battery as it leaves the leads both positive and negative free on other end of wire. If those two wires touch you are gonna short it out, cause a fire or sparks gonna fly. Doing it one polarity at a time will prevent a short.
Definitely a good point. Thanks mate.
The prevailing wisdom is the opposite btw. Negative "Comes off first, goes on last." This is with DC negative ground systems.
@@tun0fun in a battery like this it’s less relevant than that advice you note which is for an automobile. For autos the reason for what you describe is the metal of the car is negative ground. In that case you are indeed correct. This setup here has no ground so the risk of the positive shorting or negative is equal regardless of the order. That said I’d do it as you describe just out of habit as I do in my cars
@@teamvigod Yeah, it's just habit at this point.
*For others who may read this and do not know*
The reason you take the negative off first and put it on last in a negative ground system is it will prevent you from accidentally grounding/shorting the positive terminal while working.
Great no wonder shit kept smoking
I just did this. Phew!! Saved a C-note. I just poked the braided wire straight in the sprung clips. It was less secure but it worked. Thanks for a good hack.
Take some fine grain sand paper and wrap it around an ID card or an old credit card and lightly sand in between the metal prongs on the battery. It's worked for me more than once. Them things get dirty and the metal can't make contact because all the crap that builds up on the prongs. Worth a try before shilling out a predatory amount for a new battery.
"a predatory amount" is my new favourite term of currency
You're cell pairs are most likely unbalanced. Where one block out of the five has dropped below a critical threshold voltage, ie 3.00v or lower. If you have access to a power supply and you're able to break the battery apart to find the low block and charge it individually. I've had great results with this method and have brought multiple batteries back to life this way. What seems to happen is the BMS monitors the individual voltage of the 5 cell pairs and for whatever reason if they're not within a certain threshold of each other, like .5v, or what not the BMS will not allow you to use or charge the battery
had a New M18 that I unfortunately never used showing no bars that the charger was rejecting, this worked to get a couple bars and the charger excepting then fully charging. Woo-Hoo, Thanks!!
Worked for me💯💯💯💯. Left a light connector on it for months. Could of turned on and i never knew. Tried to plug it in and got the red and green flash. Did exactly what you did and it sparked for one min. Tho i was using 18 Awg wire which is WAY to small but only did it for 30 seconds before the wire got warm. Then tried to charge battery again and its alive💯💯💯💯
Fixed my 5.0 with this. Thank you very much!
This works good for any battery powered tool. Super useful to know if your going to always be using battery tools. I've had to do it with everything from my Milwaukees my dad's DeWalts and even when I brought a cheap heart. After jumping it should charge. If it doesn't run it dead and throw it on the charger.
I had that same issue, I did what you did and it worked GREAT thanks for the information 👍
Thanks Bud. this saved me $125 !
Thanks for this video
Just jump started my battery 👌
Awesome! Glad it helped
trying it now thanks
Charger is lighting up green due to one of the three banks of sells being lower than the other two. I recently saved one by pulling the pack apart, identifying the bank with the lower voltage and connecting a proper lithium charger to it. It brought the bank back up to the proper voltage and has held its voltage so far.
Nice work Corey. What do you mean when you say a ‘proper lithium charger’? Cheers
@@AddictedtoTools what you would use to charge lipo batteries for use in remote control cars, boats planes and what not. Or you could use a lab power supply.
Got small copper wire straight in without making some sort of adapter plug , 10 mins after battery went on the charger and fully charger backed to live !
(Had flashing green/red lights problem)
Thanks !
The jump start worked for me on a Bosch pro core battery. Thanks pal.👍👌
If you have 3 bars and a green charge light, you have one cell out of balance. Take it apart and charge the one cell that's low. Use a multi meter to find the low one. These batteries do not self balance the load. Hope this helps. There are a few videos showing how to do this.
No joke I just did this on one that's from 2012 and has been in my pole barn for over 5 yrs dead because I had a different brand but recently switched. It would charge but only half way at first so i charged each cell individual with jumpers on 18650 battery charger so each cell hit 4.08 volts but now it takes a full charge. I haven't yet tested how long or fast it'll drain but it's been holding charge now for a couple weeks.
Interesting. So charging them individually helped? I might try that.
This worked !!!!!! Thanks bro you saved me 175 bucks ❤
Jump start worked for me. Thanks!
That’s great to hear. 👍
Cool thanks charged for 10 minutes with a good battery then it slowed charge to work. One thing I did see was one was at 17 volts one was 18 volt so looks like imbalance so I'll run it till it stops and change again
Absolute dedication absolute.
I had one at first that wouldn't charge on the charger after a jump start. Reinserted several times and finally started charging.
Thanks bro! Didn’t know the reset feature and saved me some money!
Great to hear! Thanks for the feedback.
Worked for me. My battery wouldn’t even light up at all
I have two 5 Ah batteries exactly like yours, both had 0 bars and showed green on a charger but wouldn't charge and wouldn't run a drill. I opened up both cases. One battery had a low cell so I charged it up to 3.7 volts alone and then put it on the charger and it charged it up fully, it took about 4 hours to charge. I don't know how long it will last, it probably needs a new cell. The other battery had 2 low cells and one was actually a negative or reverse charged to 0.5 volts negative. Again I charged each one separately to 3.7V and then I could put it on the charger and charge it up to 4 bars.
This worked for me. I only had the jumper wires on both batteries for 1 second and it was enough to bring the dead battery to life so that it would charge again on the charger
Thanks for ur comment. I had no bars on battery and would flash red and green when on charger. Motorcycle battery tender kept saying it was hooked in reverse and would not charge. So i put pins in the plus and minus contacts of bad battery and good battery and then connected the plus to the plus and negative to negative with small jumper wires. It sparked and after 10 seconds i put on charger and NOW its charging!
Thanks to all of u!. Saved me from throwing this away.
Please be careful doing stuff like this. Voltage differences when connecting batteries like this will make them want to equalize immediately. This can result in sparks, shocks, LOTS of heat, melted wires, fire, damage to both batteries. It would be a much better approach to understand WHY your battery won't charge. Do you have a dead cell? Is the pack below minimum voltage? If a cell is unbalanced, try to revive it individually, if the pack voltage is too low for the charger to accept it, bring it up slowly with a low amperage float charger (like a motorcycle battery tender), once the pack gets around 13.2V, try to charge on the stock charger again.
EDIT: in my case, i used some crap chinese flashlight add-on to my M18 battery. I left it on there not being used for 4 or 5 days and found a vampire draw had brought my battery down to 10.2V. The float charger worked like a charm to revive the battery.
Does this work to fill a battery that will only charge to 3 red lights instead of 4.
Yeah it should do. I’ve got the same issue and it worked
Try leaving on the charger overnight or for a day or two. Let the BMS balance out the cells inside the battery while it's on the charger
So what happened at the end with the 3/4 bars on the battery showing charged on the charger?
Hey, it didn’t work on this application unfortunately. It’s most likely unbalanced cells which means I need to charge them individually.
What happens if your 6mm cable starts smoking. + to + checked and - to -. Both m12 6ah , one at 11.9vdc the other at 4vdc?
Worked like a charm!
Good to hear👌
My battery was fully charged at one point, then suddenly it was blinking 1 bar. So I tried charging but the green light stayed lit on the charger just like yours. I jumped mine and it says 3 bars now but still won’t charge. I’m assuming once the battery is dead, it’ll be a brick. Did you drain yours and tried charging?
For some reason it fully fixes some batteries while not fixing others. I’ve had the battery so that it didn’t even have the red light at all. But still won’t charge. Only charged from another battery.
You probably have one bad cell, take it apart and check each cells voltage to find the bad one. You can charge it up individually and it may work or replace that cell.
Would this also work on a Makita battery?
Can I jump start a 40 v battery with another battery that has lower voltage?
I have a greenworks battery where the charger is blinking red
Did it fit a 6ah. Worked. Just saved myself $196.
Just want to know could i jump start my 9.0 with my 1.5 sad as it is to say thats all i got lost my 4.0 ajd 3.0 is in the pawn with my toold 😥😢
Dose any one know why this won't work on the new forge 12 amp hour please
What about the other slots?
Cool idea. Watch from malaysia
Thank u bro u just save me some $$
That’s awesome to hear! Thanks for the feedback.
Holding the indicator doesn't reset anything on the battery. It flashes out a date code and other battery stats like how many times it's been charged. Supposedly, it also flashes to indicate a problem, but they won't release what the codes mean, so it's anybody's guess.
Might be worth pulling it apart and checking each cells voltage, maybe one is dead or faulty, u also have to get the battery to a certain voltage before the charger will charge it. I would like to see u revisit the problem and see if u can finally fix it.
Thanks for the idea. I do still have the battery, and I would like to get it fixed. I might have to revisit. Cheers👍
@@AddictedtoTools if one is low on voltage u can charge it separately with a charger to bring it back up inline with the rest then charge the whole pack till it hits 16 or 17 volts then try it on the standard charger.
Did you ever get your battery working
Heard this works with a 9v battery for 30 seconds and you don’t have to risk your working battery.
Excelent, salvè mi bateria. Gracias por este video
I jumped mine with a couple razor blades and a battery charger for a car turned it on for 10 secs and the first light of the battery came on then I put it on its charger and it started charging like normal lucky I guess lol
Oh, why the fuck did I try this first! I just ruined another good battery! It fucking arced as soon as the last wire contacted the terminal! 2 shot 8 amp batteries now! Fuck!
at least use a resistor and bring the voltage up slowly, fast charging cells that are below 3V can be very damaging to them. Or use a current limited power supply and keep below 0.3A until minimum voltage which is 15V in a M18. if flashing red led will need MIlwaukee charger to unlock it.
I used a car battery charger and it worked
Yes this works, BUT Dude do you know how many times you shorted the jumper wire together while you shuffled those batteries around ? That is not good and could cause all sorts of problems. Pay attention to what you’re doing and use contacts that are more rigid.
Hey mate. I’m actually not sure what you’re talking about. They didn’t short out at all. What video are you watching?
I tried with a new 9V small battery for 30sec, with 2 knifes, it’s charging!!!
Take the other battery plug it into the charger take it out and put the ba done back on always worked for me or take a 9vt battery and do the same thing u did with the other battery to jump it then charge it
I’ll have to give that a go mate. Thanks for the tip👍🍻
By the way the problem may not be at the battery sometimes it is from the charger
Thanks mate. The charger works with other batteries though.
Does anyone know the freeze it technique. They usually don't change because the lithium in the battery has gone hard. Freeze the battery in a plastic bag for about 2 hours then drop the battery 2 or 3 times too break up the lithium then try charge it.
That’s a great way to start start an uncontrollable fire
❤❤❤❤
You can do the same to your car with a decent charge, fires right up
I don't know how your battery charger works, but my Milwaukee charger shows green when the battery is charged, red when it's not up to power yet ?
Yes. That’s how these chargers work. Which is why this indicates that there’s a problem with either the battery or the charger from what I showed.
@@AddictedtoTools well I'm having the same problem with my other brand new battery. I'm gonna try your technique with it, otherwise the seller owes me $60 back.. seems this is not a uncommon thing with Milwaukee batteries ?
This happens with all brand batteries. Usually when they are a few years old or used a lot.
Just tried this wires started burning for some reason
What size cable did you use?
Were any children harmed in the making of this
This is not a test. This is not a test.
Did it for 10 seconds on a fully charged battery now the dead one takes a charge just fine
I think the 15 minutes you did was too long
mines still don’t work
Made me nervous watching this, you should have tapped up your leads. I thought they would touch and short out.
And watch it blow up 😂
How’s that?
Stop music please I want to hear what you saying 🙏
What when i have not old battery? Milwaukee is expensive. Problem with battery it's a joke.
Yes, they are expensive. Which is why this is a good way to keep them for longer.
Battery is gone finish!
This shit didn’t work I even burned my thumb doing it better off just buying new batteries
It won’t work for all scenarios
Did not work broke both of my batteries
This only works on certain problems for the batteries. It also didn’t fix mine.
That wont fixit my broda comon!!
How to start a fire 🔥🚒 😂
I tried this but the wires are getting really hot it started melting the rubber off
That doesn’t sound great. Did you have the polarity correct?
@@AddictedtoTools yeah plus to pluss minus to minus
What size cable was it? If it’s too small it will burn.
@@AddictedtoTools yeah it was to small i think
@@AddictedtoTools and i was using s high output 3.0 to bost a 1.5
What the # is this
What’s the confusion resul
It doesn't work.
What doesn’t work?
I got a new mil. M12-M18 CHARGER ,AND IT KEEPS FLASHIN RED AND GREEN WHENEVER I PUT IN MY M18 BATTERY. THE BATTERY IS NOT THAT OLD BUT HAS GONE DEAD BEFORE I GOT A NEW CHARGER.
If the charger is flashing, that means there’s a problem that’s different to what I’m showing in this video. If it’s not that old you’ll be able to get it done under warranty
@@AddictedtoTools I did the old 9volt battery jump trick for about 1hr then put it back on the charger and it's charging now I think the battery was completely dead. Thanks for your help.
What a failure 🤣
Maybe it's your charger
Charger is fine. It charges all other batteries and my other chargers also have the same problem with that battery. Thanks though.
It flashes red green red green. Not just solid green
Supposedly not supposbley
Those are ghetto milwaukee batteries
Australian Milwaukee batteries
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