Thank you for this information. It saved my battery and it's so easy and simple. I'm glad I keppet my battery charger after I quit vaping. I'm basically a certified battery doctor now. Thank you.

@fixer2u

11 ай бұрын

Haha that's awesome, glad it helped!

@Tanoforfucksake

5 ай бұрын

I’ve watched one to many battery explosions lol I’m paranoid watching mine charge. Have an older charger, so it just has a light indicator, so I rigged my volt meter so I can keep an eye on the voltage.

Great info. Just done a 9ah and a 12ah both with same issue. Both are going fine now. Cheers mate

@fixer2u

Жыл бұрын

Awesome! Glad it helped!

You're a life saver! gonna try this today!

@fixer2u

11 ай бұрын

Hope it helps!

Outstanding, thank you; easy to follow and makes sense!!

@fixer2u

9 ай бұрын

Thank you! Glad it helped!

Thank you for sharing your knowledge! I learned a lot from this ! I really hope fixing becomes more popular it helps people in more ways than just fixing something!!! Thanks again 👍

@fixer2u

5 ай бұрын

You are welcome, glad it helped!

Thank you for sharing this video! It helped me save 2 HighOutput 6.0 battery's

@fixer2u

9 ай бұрын

That is awesome! Glad it helped!

This just saved 2 batteries for me. a 12 and an 8 ... could have saved 2 x 9ah if i had known earlier .. Awesome job mate.. well done

@fixer2u

9 ай бұрын

Thank you! Glad it helped!

@sccolbert

11 күн бұрын

Exact same situation for me. Kicking myself for throwing out the two 9ah batteries.

Great video! Thank you so much. I'm now charging the second low bank.

@fixer2u

7 ай бұрын

Awesome!

Very good video will save DIYers a lot of money including me thanks for the information

@fixer2u

Жыл бұрын

Thanks for the comment! Hope it helps!

I had to order the charger from aliexpress, but once I got it, hooked it up and saved 2 batteries. Thank you for the video.

@fixer2u

7 ай бұрын

Awewome! Glad it worked!

@thebigbravo3529

3 ай бұрын

Hey what brand of charger did you buy from Aliexpress? There so many to choose from.

Just fixed an XC8.0 with a $30 "MiBOXER 18650" charger I had lying around from flashlight games. Definitely important that it's a current-limiting charger, but at 200mA nothing even got warm. Thanks for the video!

@fixer2u

Ай бұрын

Awesome! Glad it worked!

Great video I have been looking for an easy way to balance a battery pack you found it thank you

@fixer2u

8 ай бұрын

Glad I could help!

Great video mate it was very clear and easy to follow. Can't wait to fix a couple of faulty batteries I have here.

@fixer2u

Ай бұрын

Thank you for the comment! How it helps!

Very helpful, thank you!

@fixer2u

10 ай бұрын

Glad it helped!

Thank you for another great video.

@fixer2u

10 ай бұрын

You're welcome!

I ordered the same charger after watching this video and fixed my 8ah Milwaukee battery charging 2 cells at a time. Thank you for this video, you saved me and others I will help in the future if they ever get the same issue, a good amount of money in the long run.

@fixer2u

7 ай бұрын

Awesome! Im glad it helped!

@mrcastro8740

4 ай бұрын

Wanna make some extra cash. I’m not too smart I’ll send you my bad batteries it’s 4 of them and pay you to repair them.

Big thank you, I was able to save my battery with you help. I think the problem is when you run a battery down on a tool until it has no charge left this is what happens.

@fixer2u

3 ай бұрын

Your welcome! It seems to happen to mine even when I do not run them down. For me this happens when sitting. Some of the cells slow drain.

Good video. Great explanation.. only thing I could suggest is link in description on the charger you used.

@fixer2u

Жыл бұрын

Great Idea, I will add it!

You saved me $500 my man! Both of my 12.0 batteries were dead, all banks were around 3-3.8v on both of them, charged each bank back up to full, slapped it on the charger to "reset" it and now i have full 4 bars of charge again!

@fixer2u

2 күн бұрын

Awesome!

Great video, good info im ready to fix 2 of mine that are doing this.

@fixer2u

8 ай бұрын

Awesome hope it works!

worked like a charm on my unbalanced 8 amp hour m18. working on a 9 now... wonderful

@fixer2u

Ай бұрын

Awesome! Glad it worked!

Thanks man. I am so going to do this.

@fixer2u

7 ай бұрын

No Problem!

Great video! Thanks so much! I am regretting throwing away two of my 5 aH Milwaukee batteries that I couldn't get to hold a charge. Now I know!!!!

@fixer2u

Ай бұрын

Thank you! Sorry for your loss!

Thank you for the video 👍

@fixer2u

6 ай бұрын

You are very welcome!

Thanks! Fixed my 12.0 and about to start working on a Bosch battery

@fixer2u

5 ай бұрын

Awesome! Glad it helped!

@dillongross526

5 күн бұрын

I love Bosch for their demo hammers and jack hammers but man I’ve seen so many of their drills impact a not burn up just mixing concrete thing was smoking a naught brand new that day! After cooling down it worked, but my Milwaukee doesn’t have those issues ever.. Milwaukee might be pricey an have name tags like it’s god damn designer clothes of the tool world, but man I’ll still choose Milwaukee and their shitty warranty’s for the trade off of a great product that seems to out preform most in most ways… Ridgid is the best for warranties however an they make amazing sewer cameras and locators also but still I gotta go Milwaukee

@dillongross526

5 күн бұрын

I love Bosch for their demo hammers and jack hammers but man I’ve seen so many of their drills impact a not burn up mixing concrete full on smoking with a brand new, that day drill! After cooling down it worked fine, but it slowed me down significantly and that’s not worth it to me.. Milwaukee doesn’t have those issues ever for me.. However pricy Milwaukee might be a the fact the name tag makes it seem like it’s god damn designer clothes of the tool world! But man I’d still choose Milwaukee and their very shitty ass warranty’s, just for the trade off of a great product that seems to out preform most in most ways/applications… Ridgid is the best for warranties however, even a life time warranty on their batteries no one does that! an their sewer cameras are next level same with the locators! But I gotta go Milwaukee on all my other tools..

I have an old RC variable lithium charger that I tried with on one of my 8.0 amp batteries that dies very quick but then charges almost immediately. Flashing light recently that won't run a tool and shows green full charge on the charger. I was able to bring up one bank that was below 2 volts. This was a life saver! Thanks for the video!

@fixer2u

5 ай бұрын

Awesome! Glad it worked!

@commonsenseisdeadin2024

5 ай бұрын

I have (2) 9Ah batteries doing that same deal, battery needs to be rebuilt or the circuit board is shot. I haven't rebuilt one yet to find out but i did charge each row with a bench PS and it worked fine for a short time before dancing it's jig again! For the price Milwaukee charges I'm rebuilding! Fool me once, shame on you, i will not be made a fool a second time! 😂 You can buy a spot welder, nickle strip and beast cells for less than 1 new battery, only have to buy the spot welder once!

@kickford

5 ай бұрын

Time will tell on my 8.0 ah battery issue returning. Like you I wouldn't mind rebuilding them if it comes to that. It seemed to take all day at 500 milliamps to get the one bank up from 1.3 volts to around 4 volts. They say their battery system is supposed to prevent draining batteries below 2.5v, but that doesn't work very well. I have a couple 4.0 ah milwaukee batteries from 2010 that still work fine to this day! But apparently the larger the amp hour the bigger the potential for this stupid balance problem. I did rc for several years. As costly as these batteries are I just don't understand why the manufacturer doesn't make these battery cells/banks balance capable. That's basically what we're doing to even them back out.

@commonsenseisdeadin2024

5 ай бұрын

@@kickford I think a lot of it is to do with more bad batches of cells. They are rushing development so testing and QC lacks! The people have become the testers/guinea pigs and at the price they sell them they are taking the "risk" of potentially having to replace large quantities into consideration already..... Passing the buck right back onto us! That's never been made more evident than with "self checkout"! Shit isn't any cheaper and these companies have the audacity to complain about product loss when they don't pay the employees selling the products 😂!

@fixer2u

5 ай бұрын

@@kickford I know what you mean. Very frustrating!

Very cool👍thank you Sir

@fixer2u

6 ай бұрын

Very Welcome!

I bought 3 12.0 batteries and they all did this. None of the other milwaukee batteries have done this. Thanks for the tutorial i gotta try this

@fixer2u

8 ай бұрын

Hope it helps!

@Hyundairobitdog

8 ай бұрын

@fixer2u I am currently reviving a dead 9.0 and its working . Got 2 more 9.0 to fix thanks for the great video. Odd thing never had a 4.0,5.0 , 6.0 do this and I have been using them for atleast 11 years

@fixer2u

8 ай бұрын

@@Hyundairobitdog no prob. Glad it's helping! Same... I have 2 4ah and 2 5ah that have been perfect for the last 10 years. I've read that Milwaukee changed brands on the cells and they are not as reliable...

@rkwjunior2298

Ай бұрын

Yup, just my 9amp batteries

@SteveSherman-jp1dz

Ай бұрын

The bigger the battery and higher amp draw tools you use, the more this problem will show up. It's all down to the 50mA resistor not being enough to do balancing during a normal charge cycle. The faster chargers are even worse.

Those hex bits with the holes in the center of them are referred to as tamper-proof torques so not just any wing nut can remove them. Hehehe Hey brother good video informative educational I think some of us might have learned something today thank you keep up the good work

@fixer2u

9 ай бұрын

Awesome! Thank you for the comments!

Great video. Thanks.

@fixer2u

2 ай бұрын

You are welcome! Hope it helps!

Awesome video...I just ordered the next available version of the charger (Opus C3400). What guage / type wire did you use for the leads?

@fixer2u

Ай бұрын

14 gauge braded. I wouldnt go much thinner!

This is excellent. I've got 3 high cap batteries that only work for half their capacity. I'm going to give this a try. I've also got a coworker facing the same issue with his that I'll see if I can fix.

@fixer2u

9 ай бұрын

Awesome! I hope this helps! Let me know if it worked!

@trantem

9 ай бұрын

@@fixer2u It did! $850 worth of batteries back in action now.

@fixer2u

9 ай бұрын

Great! @@trantem

Sounds like Milwaukee needs to fix that issue not the consumer.

@fixer2u

4 ай бұрын

Agreed!

@tigervxii

Ай бұрын

they won't fix it, they rather you buy a new battery and make them money.

@michaelpouchert4486

Ай бұрын

You'll need to send it to China

@fixer2u

Ай бұрын

@@michaelpouchert4486 haha maybe!

@cool2180

29 күн бұрын

the battery management board is not doing its job

Best video on this...

@fixer2u

Ай бұрын

Thank you!

Thanks bud I tried this and it saved my 12 amp battery. It took about 24 hours to get my battery charged back up. It was totally dead

@fixer2u

9 ай бұрын

Awesome! Glad it helped!

Thank you mate - good ide to use home battery charger. Just one question - for how long this has solved the problem for the batteries? DId the problem showed up again ? If yes - when?

@fixer2u

6 ай бұрын

You are welcome! For me it has been a year and they are still going strong. I do not use my batteries every day like some so I would guess results may be different for others.

Great video pal any links to a suitable charger for us across the pond 😂 thumbs up 👍

@fixer2u

9 ай бұрын

Thanks for the comments... Oof, I have no clue to help you on that. IS there a version of Amazon over there that you might be able to do a search?

What's causing that problem is that the internal resistance of the cells are getting mismatched and the bms in the Milwaukee battery is failing to bring them close in voltage. To make matters worse, having higher amp hour in the battery and high amperage draw from the tool, increases the probably of that happening. DeWalt doesn't have that problem cause what makes the cell balancing is the charger itself, not an internal bms in the battery.

@fixer2u

Жыл бұрын

Interesting....

@Millzlane

10 ай бұрын

The charger doesn't balance shit. Neither does the bms. The bms only manages overcharge and over-discharge. All cells are simply not the exact same in it's quality. That's all. You'll have a bad one here and there. If the bms sees even one cell reach it's max charge, it's going to signal full. THAT'S what's going on. But yea you can balance em back, but because of the bad cell resistance, it's going to happen again anyway in due time

@Millzlane

10 ай бұрын

@@fixer2u👌🏾 but tell em get the warranty

@fixer2u

10 ай бұрын

@@Millzlane correct. But so far I have had good luck. Both the 9ah I have used this method on are going on a year now and they are still balanced.

@Millzlane

10 ай бұрын

@@fixer2u ok. That's good. It must've been that one high demand use that drove that cell to expose itself. He's hiding now. Lol

Genius diagnosis & solution. I have a wild thought. Could we simply connect every 4.2v bank in parallel and let them equalize themselves? My XC 8.0 has the same issue too !

@fixer2u

7 ай бұрын

I actually do not know the answer to that but I have seen guys connect to a bank on another battery to equalize. It just takes longer.

I had 4 of 5 cells low. Charged all of them individually and the battery is like new. Thank you

@fixer2u

Ай бұрын

Excellent! Glad it helped! Thanks for the comment!

@michaelpouchert4486

Ай бұрын

@@fixer2u I have other batteries blinking 1 bar and I was experimenting and fried my charger. Have you tried to charge cells with another fully charged battery?

@fixer2u

Ай бұрын

@@michaelpouchert4486 I know you can do it. To me it seemed more efficient to use the charger, but it can be done.

Thanks for this vid! I bought the same charger to revive two 8.0s. It brought one of them back, but on the other one, all banks read 4.19v but only 3 of the leds light up.

@SteveSherman-jp1dz

Ай бұрын

It could also be a burned out LED. Another common problem.

@fixer2u

Ай бұрын

Hrmmm that is odd.... Maybe the 4th LED is burnt out? Does the battery seem to have the proper life?

Thank you

@fixer2u

4 ай бұрын

You're welcome!

I think you need a DC power supply. Much easier than Jerry ringing a charger. It turns off just the same when the voltage is achieved. I have the NANKADF 30V 10A its very useful around the shop.

@fixer2u

9 ай бұрын

I am not sure you can use a dc power supply on LIon batteries...

@cs-xd9gy

8 ай бұрын

If you have an adjustable one, it will work fine. Set the voltage and it will stop charging when you hit. 4.2 volts.

@fixer2u

8 ай бұрын

Good to know! Thank you! @@cs-xd9gy

FYI - don't get greedy and try to charge two low banks at the same time. My Opus charger briefly flashed 4400ma as the charge rate as the banks tried to equalize through the charger when I hooked up the second set of leads. Yeah, those banks are still in series so can't hook up to two at once. Charger survived, tougher than it looks. Thanks Fixer, don't remember if you mentioned that, watched this long ago and just skimmed again now.

@fixer2u

11 күн бұрын

Thanks for the comments. I did not mention that but found the same thing out!

If the voltage of any cell, pair or trio approaches 4.2v, the Milwaukee charger stops charging. I like most the "defective" Milwaukee M18HD12 batteries that I get for free or buy for 10-15% of the new price that cannot be fully charged. Cheapest and easiest repair. With the external charger, I equalize the cell voltages and put the battery back in the charger. Greetings from Switzerland

@fixer2u

3 ай бұрын

Greetings! Exactly the case!

I have 2 M18 12 batteries that only show 2 bars and then show fully charged. I would love to try this but to be honest, electricity and thought of blowing these up scares the heck out of me. The link provided doesn't appear to be for sale but they have the C3400 which appears to be same but next model up. Would love to fix these.

@fixer2u

21 күн бұрын

Any charger that will do lithium ion batteries will work.

Well ill be darned! I actually HAVE one of those fancy chargers! When i started watching, i instantly felt doomed as soon as i found out i needed to buy a special charger....then you rolled out old faithful as my wife and i call it, and began showing us the way! I cannot even believe it! Thanks foe the video, and yeeehaw! Now mine will be the only gd damn battery it wont work on Haha! As always, hope for the best, always prepare for the worst!

@fixer2u

4 ай бұрын

Hahaha, glad you got lucky! Good luck!

I have 2 12s and a 9 that needs some CPR. Gonna try your method and see if they come back to life first.

@fixer2u

6 ай бұрын

Check those cells and see what they read!

This Man deserves a new Fluke, or at the very least, a new Klein MM. 😊 I am going to try this on a couple of my M18 XC batteries that give the ‘Christmas lights’ when placed on the charger, as well as a couple of my M18 8.0 HO ( expensive ) batteries with the full charge showing only 3 bars. I have a NiteCore charger that will charge LiIon batteries up to 21700 in size, so will try this. I have scrap dowels lying about, so will give it a go. I’m thinking the NiteCore charger will suffice?? What say You? Much appreciated! 👍

@fixer2u

2 ай бұрын

Thank you! I would think your charger will work!

Also, what you referred to as a Bank are just batteries in parallel. The more batteries in parallel the more capacity Connecting multiple batteries or what you refer to in this video as banks increases voltage. Easiest way to explain this especially for those that may not understand with the lithium batteries is showing here is think of car batteries if you get 12 V batteries that are 100 amp hours and you connect them all the positives together and the negative to negative you’d have a 12 V 400 amp battery but if you went from the first battery to the next batteries negative and so on on both sides you increase the voltage to 48 V, but your amperage would stay at 100. You would referred to this battery as a 5S3P. 5 cells in series 3 cells in parallel.

@fixer2u

8 ай бұрын

Thanks for the comments. I was referring to them as "banks" in order to help show the viewers how to keep it straight which batteries were with what. Does that make sense? Hard to explain in text.

The reason you are having a hard time getting readings is because the HD 12's have a protective coating. I noticed that my 9.0 I could just touch the banks and it worked fine. If you just tough the banks on a 12 it won't work because of that coating. You have to scratch through the coating first. Its very annoying for charging with the Opus as well. That is the same charger I use as well. I have to get the leads to dig in so that I can start the charge. It irritates me to no end that Milwaukee continues to have this issue with such incredibly expensive batteries. The solution to this issue is for Milwaukee to include a BMS that can actually balance the batteries. They claim that it can balance the batteries but it doesn't. And I feel that this is designed this way so people can buy more batteries of course. I have batteries that are from 7 years ago that still work fine. The charge isn't even that bad tbh. But they have gone out of balance several times and I fix them every time it happens and mark each battery when it happens so I can keep track of how often it happens on the battery. A true BMS system that balances batteries would look at each battery and make sure it is at the correct voltage at the end of charging. Vs milwaukees which likes to stop whenever one bank shows roughly 4.1v leaving the rest uncharged. And when milwaukees BMS system shows around 3.2v or so, it shuts down the tool. This is exaggerated when one bank only gets charged to 3.6v when the rest are 4.1. Even though most of the batteries are full, you will only get the life of the battery bank that is lower.

@fixer2u

8 ай бұрын

I know what you mean. I have a Traxxas RC truck and the charger for the LiPo batteries has 3 options to charge. Fast, Balance and Storage. I always use the balance option. Milwaukee needs to have at least balance and fast as options for its chargers and that would help a lot.

@georgedavall9449

2 ай бұрын

Hey Michael, great comment and info! I know what You mean and am in full agreement. Not knocking Milwaukee as I am a fan, but the M18 batteries are the only ones I have ever had problems with. I have been a ‘victim’ of the M18 8.0 HO batteries and the full charge only showing 3 bars issue. And as I’m sure You know, don't ever let a M18 battery sit too long on a low charge. This never happens with any of my DeWalt, Makita, Metabo HPT, etc. And Milwaukee, whilst usually real good with their E -Service, aren’t so good with battery warranty claims. Appreciate the comment Michael. Stay safe and well!

@SteveSherman-jp1dz

Ай бұрын

​@@fixer2u A trickle charger that balances and reconditions old batteries would be the easiest solution. I wonder if the problem was addressed with the new Forge batteries and chargers. I've been holding off on buying any more of these 12ah batteries and still waiting for the release of the new ones which should have been out by now.

@fixer2u

Ай бұрын

@@SteveSherman-jp1dz You are correct, balancing is the answer. I have some LiPo rc batteries and a charger. The charger has the option for balancing or fast charging.

Good video i just need to buy the other tools to check the battery

@fixer2u

Жыл бұрын

Thank you and good luck!

After you set the charger to “charge” will it just auto charge to the correct voltage or do you have to keep checking and pull off at 4.2 volts?

@fixer2u

10 ай бұрын

It will charge to the correct voltage and say "full" on it.

You are a righteous dude.. thx for taking the time to make the video.. now if you could just tell me how to get my Parakeet to eat my diarrhea all would be good 😂😂

@fixer2u

8 ай бұрын

I literally have no idea how to reply to that! LMAO

How about the 12 volt batt's? Great vid thanks.

@fixer2u

10 ай бұрын

I have not had any issues with my 12v batteries so have not tried messing with them.

@MyBigThing2010

3 ай бұрын

The only ones that give issues are the 6.0 m12... they'll do the Christmas lights on the charger and won't charge. I have an off brand m12/m18 charger from Amazon and that charges those batteries and they don't error on it. Then they work fine again

This has just happened to one of my 12ah batteries, not even 2 years old but i didn't register it for warranty. 220 quid battery should not do this. thanks for the video.

@fixer2u

4 ай бұрын

I agree! Sorry it happened!

What i do is put it on a tool that has high power draw like a leaf blower and run it for a few minutes, after they discharge a bit, it will take a charge easy

@fixer2u

8 ай бұрын

I did try that, but the fact remains that one or more cells are behind others and the gap is enough that the ones that are behind will not catch up enough to make it say full charge.

The spring slots needs to be cleaned with contact cleaner. A little bit of fine sandpaper.

@fixer2u

6 ай бұрын

You are saying you believe that is causing the imbalance?

Gday mate, I have a 12amp in the same situation. Will give it a crack and see how I go. Cheers

@fixer2u

6 ай бұрын

Awesome! I hope it works! Merry Christmas!

Keep your sales receipts-HD warrants these batteries for up to 3 years from purchase. Just took a M18 6.0 back that was 3 months old that wouldn’t charge anymore, gave be a brand new one.

@fixer2u

9 ай бұрын

What if I didn't buy them from Home Depot?

@stevebabiak6997

9 ай бұрын

@@fixer2u - TTI makes Milwaukee, Ryobi, and Hart (Hart is in Walmart). I believe that is who gives the warranty, but at least with Ryobi they will use the date code of manufacture if no receipt.

@fixer2u

9 ай бұрын

Ahhh ok, good info, thank you! @@stevebabiak6997

Coloured tester leads are best 😂

@fixer2u

2 ай бұрын

You've got to work with what you've got!

Thank you! I got two batteries with this issue, very frustrating considering how much you pay for them

@fixer2u

2 ай бұрын

Agreed! Hopefully it helps you!

thank u it works but what i use to charge it is a usb charge port

@fixer2u

Ай бұрын

How do you do that?

I have a question, if I do not have a battery charger could I accomplish the same thing if I drain each bank down to balance out the good and bad banks, then put it back on the m18 charger?

@fixer2u

8 күн бұрын

Yes that should work as well!

Can you put leads from the milwaukee charger if you don't have the fancy charger?

@fixer2u

Жыл бұрын

I would say probably not, because the charger will put out 18V for the whole system, not just for each battery.

@mrfreewayboy

Жыл бұрын

@@fixer2u Good point, thanks

I had a bank (M18 12AH) @ 3.67 and it took almost 12 hours to get just below 4.2... Is that normal, in the video you mentioned an hour? Great video by the way, thank you.

@fixer2u

2 ай бұрын

Thanks for the comments, what did you have the amps set at on the charger? Mine has taken that long. Since I have published this video, I have had to do this on other batteries.

Dumb question, bit can't you jump these by doing what you have there but instead using another battery? Like when you jump one that has flashing red & green light?

@fixer2u

6 ай бұрын

Yes you can, it just takes longer!

I’m sure someone must have mentioned it but they’re called security bits just in case.

@fixer2u

8 ай бұрын

Thanks!

Could I use the c3400 cant seem to find that model you have anywhere

@fixer2u

3 ай бұрын

You can look up other chargers on amazon that have the ability to charge multiple battery types including Lithium Ion.

Just a heads up: when you take the casing off, there’s +/- all along the bottom of the banks on the plastic. Clearly indicated. My question to you is: with the banks that are connected together with the metal. How do you know where to put your wires. Wouldn’t it short out the bank that shares the same weld plate thing? That’s a detail that I really would have liked you included. Cheers.

@fixer2u

2 күн бұрын

The banks run up amd down so where you see the plus minus marks on the plastic, just go straight up.

@azazelone905

2 күн бұрын

@@fixer2uI realize that. What I meant was, are the vertical banks insulated from each other somehow? Because from what I gather, when you charged the second bank, you slipped your positive/negative leads in the same way. Adjacent the second vertical battery bank. My question was: that whole metal façade… how is it not pushing voltage to the previous bank as it seems it’s all on the same plate. (Except for the 5th one of course) Maybe a dumb question. Sorry. I’m about to do one of mine based on your tutorial.

@fixer2u

2 күн бұрын

@@azazelone905 not a stupid question! Yes the banks are isolated because they are wired in parallel but are in series with the other banks.

Could I do this to any old M18 battery to "refresh/recharge" it?

@fixer2u

6 ай бұрын

Yes!

Once you balance the cells, what keeps the problem from occurring again- can the bms circuit be fixed so the battery charges properly on its own?

@fixer2u

11 ай бұрын

From what I have read, not draining the battery until dead dead amd not storing the tool with the battery installed can help with the issue. I cannot answer about fixing the circuit.

@jonathanglass116

9 ай бұрын

Would the battery goes bad if I keep using it like that without fixing it?

@fixer2u

9 ай бұрын

It would probably get to the point it would not charge again if one cell gets too low. But you could still fix it with this method.@@jonathanglass116

What causes the certain banks to go lower? Will it happen again?

@fixer2u

Күн бұрын

The Milwaukee charger are fast chargers only and do not balance the cells. Yes it can happen again unfortunately.

I have a 12Amh battery that is just out of warranty and it just plain died after just a few minutes on my blower. Charger won’t recognize that the battery has been put on to charge and not lights on the battery will light up. Any hope for this battery?

@fixer2u

4 ай бұрын

Id say pull it apart and see what the cells say.

Hey what settings should i use with a RC car charger ? 7.4V or 11.1 ?.. & charge at what ?

@fixer2u

Жыл бұрын

I do not think an RC charger will work as the M18 batteries are 18V.

@everythingisvibration

Жыл бұрын

@@fixer2u Yeah, I tried it. Said it was to low to charge at 3.84 V . That’s 18V ALL together, Im Only charging 1 Bank at a time. Don’t think it was because of the 18V though. I’ve tried everything with thing. To experience to junk, I’ll just take the good batteries out & charge them & make something new.

@fixer2u

Жыл бұрын

@@everythingisvibration oh I misunderstood what you meant. I've never messed with an rc car charger so I won't be much help here unfortunately.

so I couldn't buy the exact battery charger but I got one pretty similar. I have been charging at .5amps but it is really slow.. mine can go up to 1.5amps and is there a reason not to go any higher than .5 amps? I have 8 batteries to go through and I wonder if I can save some time by charging them a little faster..

@fixer2u

11 ай бұрын

Yes it does take a while. I have tried it at .75 amps but not at a higher amperage than that. You could give it a shot at something higher, but I would monitor it to make sure nothing is getting hot.

@jeffjeong9035

11 ай бұрын

@@fixer2u Thanks! also, I have you tried charging multiple cells of the same battery pack at the same time or should I only charge one at a time? I've been charging a cell from 12ah at .5amps and it has taken over 12 hours only to bring it to 70%. I have 5 to go through from each battery x 8 batteries, which is going to take a whole month to charge batteries I have... being able to charge multiple at a time would be helpful for sure.

@fixer2u

11 ай бұрын

@@jeffjeong9035 Do not try and charge more than one battery at a time, There is a common ground so it will short out the charger and probably ruin it.

@stevebabiak6997

9 ай бұрын

The individual cells within the battery are going to have a rating for charging current. You have the battery open already, so look for the part numbers and manufacturer name on the cells. Then find the spec sheet for that type of cell. I think you will be able to use higher charging currents, but it depends on those cells.

@fixer2u

9 ай бұрын

Got it. Good info, thank you. I will check next time I have to pop one open!@@stevebabiak6997

How do you automatically get 4.2 if you set it to charge up to 5.00 mah? Also, I'm lost on polarity. So, it looks like the battery starts on negative on bottom left and ends on positive at top right. Series. So when you charge band 2 starting at bottom, should you flip from positive to negative on the next jumper to bank 2? And swap going to the next? And swap against until you end at top right positive? I saw your second charge and you switched the left negative blue 12v ring hole wire to the next one in line. I'm confused. Anyone know how to explain this better? Thanks

@fixer2u

4 ай бұрын

4.2 is Volts not amps. The charger is a smart charger so it knows what the max capacity of the battery is. so it stops at 4.2V and its 500mA not 5.00 mAH. I have since tried this on other batteries and have used the 2000 mA. As for polarity. If you look at the very bottom of the banks, it shows you which ones are pos and which are neg. Yes they do alternate each cell. That is why I encourage you to use a multimeter and make the polarity on each one so you can see for yourself how they are laid out. I hope this helps. Feel free to ask more questions.

Will this then make it able to charge the batteries in a normal charger after you do this?

@fixer2u

6 ай бұрын

Yes sir it does!

Does that charger automatically set itself to 4.2 or do you have to manually set the voltage? I just bought a 12amp battery and it’s doing this exact same thing

@fixer2u

3 ай бұрын

I automatically says "FULL" at 4.2V.

@1408amac

3 ай бұрын

Awesome just ordered that same charger thanks so much

@fixer2u

3 ай бұрын

@@1408amac You're welcome! Hope it works!

what i did was , i took another battery and ran jumper wires to the pos and neg terminals and let it sit for some time and the battery actually started to charge , but i do have others with problems and 1 i tried this with but it still failed with a flashing light and green on the charger, which im suspecting a bad board. thanks.

@fixer2u

4 ай бұрын

Interesting... And you double checked that all the cells were balanced?

@rick3090

4 ай бұрын

this was before i took it apart to investigate, the other 2 that gave me trouble were so far successful with the jumper wires.

@fixer2u

4 ай бұрын

@@rick3090 Oh I see!

Have you tried this on different brands? I guess it will work, I have 2 bosch batteries doing the same

@fixer2u

8 ай бұрын

I have not. I only have Milwaukee currently but I do not see why it would not work!

Battery Issue. The Fix is Place a Jumper from bad battery to a good charged battery. Pos + to Pos + and Neg - to Neg- terminals wait for about 15 minuets for battery to equalize. problem solved. both batteries are ready for work or charge to full

@fixer2u

2 ай бұрын

I have tried that method and even left the batteries hooked up for an hour. It was not successful.

Interesting. Would it be the same result if you would discharge the cells with higher voltage to the level of the lower and then charge the whole battery full with the milwaukee charger?

@fixer2u

Жыл бұрын

I would imagine it would.

What type of charger do I buy for the lithium battery

@fixer2u

8 ай бұрын

There is a link in the description!

Realistically, how long can this prolong a battery's life? I've probably owned my battery for less than 3 years but I didn't think to keep the receipt since I generally take meticulous care of my stuff. I'm imagining having a hard time trying to get warranty help, so I'd like to go this route, I'm just unsure how much longer I can expect to get out of my battery even after doing this. I would hate to do this then just a few charges later, have to do this again, and again etc. Thanks in advance!

@fixer2u

8 ай бұрын

My 9ah batteries I did over a year ago now and they are still holding up. So even if it is once a year or once every 6 months, For me it would be a win.

@TheDemiDestroyer

8 ай бұрын

Yeah that's not bad!

@fixer2u

8 ай бұрын

No guarantees but that is where I am at!@@TheDemiDestroyer

@disht2

7 ай бұрын

Milwaukee has an awesome warranty. They look it up by the battery or tool itself. You have to take it directly to a Milwaukee warranty store. They have more than most people realize.

@fixer2u

7 ай бұрын

This is true!@@disht2

So do I have to do this everytime when I charge my battery? Seem like it's not worth having a battery power tool.

@fixer2u

2 ай бұрын

No you do not need to do this every time. I have had to do this twice in a 12 month period.

@michaelpouchert4486

Ай бұрын

You can do this with a car battery or battery charger. Make a jumper and charge both banks at the same time

@fixer2u

Ай бұрын

@@michaelpouchert4486 if that charger is rated for lithium batteries. it is very dangerous if it is not.

Just take 2 razor blades and 2 batteries one good battery and the one that doesn’t work, go positive to positive and negative to negative This will charge up the dead cell (without having to take anything apart or having to buy anything, long as you have more than one charger) If you want to be more safe and not risk ruining the other battery, (yet this has never happened to me) but you could also do it with wires, then on the positive side add a fuse to insure you don’t crap out 2 batteries.. However I just risk it an haven’t had an issue and have fixed all my chargers!!💯

@dillongross526

5 күн бұрын

Also forgot to add I let the connected batteries sit together for 30 minutes every time… an then I throw the non-working battery on the charger and im back in business battery good as new! I think this could potentially blow up, I’m no electrician, so don’t do it in the kitchen like me lol go outside and stand back for the 30 mins to be safe.. however I don’t think it’s possible for them to blow up do to being the same voltage… It definitely works though saved me tons of money, I’m always stoked when I see someone go to throw away a “non-working battery” I always say “I’ll take it, I scape at the end of every year and they give a tiny bit 4 batteries (not really true lol) I’m tryin to save up some batteries!! hahah jk I always will just help most people an teach umm not to throw them out an I always risk my battery to save theirs lol (too nice) haha Now time to buy the one part to fix my sawzall, really don’t want to fix it though, wanna use it as an excuse to get the hacksaw for my wife… “my sawzall is completely unfixable, time to get the one that works better for plumbing” hahah I mean it’s not like you can ever have too many tools 🤷‍♂️

@fixer2u

4 күн бұрын

@@dillongross526 I will try an hour as 30 min didn't do much for me..... What size battery?

Hi ,where i can buy that charger you used to recover that battery , please thank you

@fixer2u

5 ай бұрын

Amazon!

@juancaballero8107

5 ай бұрын

Whsts the name of the character please?

@fixer2u

5 ай бұрын

There is a link in the description. @@juancaballero8107

Nice trick Fixer2u 👍 Help me undestand how it worked. I havent got charger but I just save my 5Ah with 2 wire 1,5mm2 connected from one batterie fully charge to an oder one over discharged for 1min without opening anything. After that the Milwaukee charger works. The batterie has just 3 months .. ( I lost the garanty) Don you think using this methode with different battery capacity could be risky ...? Thanks for your works from France !

@fixer2u

3 ай бұрын

Sorry I am not sure I quite understand your question?

What type of wire to do the positive and negative clips?

@fixer2u

9 ай бұрын

I'm not quite sure what you mean?

@abelgarcia480

9 ай бұрын

What type of wire to use to make the positive and negative connections to the lithium ion battery charger

@abelgarcia480

9 ай бұрын

Thank you for replying 👍

@fixer2u

9 ай бұрын

I just used a braided copper wire. 10-12 gauge wire should be fine. @@abelgarcia480

@DirectCurrent4u

8 ай бұрын

@abelgarcia480 16 awg will work just fine.

My hd 12's are the only batteries from milwaukee ive wver had this problem with

@fixer2u

Ай бұрын

Some of my 9ah have this and some don't.

What about batteries that will not charge and have blinking red/green lights?

@fixer2u

4 ай бұрын

Check and see what the cells read. One may be so dead that the charger will not try to charge.

Hope it’s works on mine

@fixer2u

8 ай бұрын

I don't see why not! Let me know!

Do you know of a smaller cheaper one because this charger is no longer available

@fixer2u

4 ай бұрын

Looks like this one will work. I have never used it though. So do a little research please! www.amazon.com/EBL-Discharge-Functions-3-2VLiFePO4-Rechargeable/dp/B0BS6GF5ZJ/ref=sr_1_45?crid=2UA3EDOUC5G33&dib=eyJ2IjoiMSJ9.0z1Ap0SDETC7UFpwucj4Rua_8Nv8mXXwxBY-N-1Gs23_wKcE-o9RqAxtU8ZPPIVE5ZNO-QEknY-9CufghrOhLDMtWGleXM1nfaZbLfJ-7Lu2UZFEqvAK_Tc173pY15ZcwldxCNImA-D38gDDpSYVWSRteurpIGkqaMQNwBRGQGlZ001SdpLHdL334Q5VrEsGJudT6REVbcPsNPjcdgL0RMZ7SHvZdeuBVnexArH2h60utXhII4ffbiLKO0gNahct6u0fVCEO7hWLwL_GkPI4XHsQRrFenTsHEexhD9zDmWc.aYOzqHMQVUX206UbQp5lTvyChZX2sit3lcj4K8i_8d4&dib_tag=se&keywords=lithium+battery+charger&qid=1708694983&sprefix=lithium+battery+charger%2Caps%2C126&sr=8-45

My 12ah battery stop charging too . I like to fix it but I don't have any of those tools to make charge again. So right now I have this battery to show-off when people want to brag about there batteries 😂😂 they say good things about their batteries I tell them that I have a 12ah battery too😂😂.

@fixer2u

8 ай бұрын

Haha nice!

is this something that affects Milwaukee batteries only, or do other brands suffer from this problem?

@fixer2u

7 ай бұрын

I have heard Ryobi has it but not sure about other brands. All I currently have is Milwaukee.

Im scared to do it how bad will this will explode when wrong connection?

@fixer2u

7 ай бұрын

Not sure, have not tried that!

Okay what if my batteries stone cold dead? How could I fix it then?

@fixer2u

3 ай бұрын

Does it say all the cells are dead?

After this fix, your regular Milwaukee charger still charges these batteries correctly after using your battery? Are they still working for you?

@fixer2u

25 күн бұрын

Yes the Milwaukee fast charger still works. I have had to repeat this process like every 3 months though.

The fix works great ! It has 4 bars !! But at the next charge got 3 again.😢 is there a permanent fix?

@fixer2u

Күн бұрын

It is best to charge all the banks to get them equal at as close to 4.2 as you can get.

@ivallejo1456

Күн бұрын

@@fixer2u I charged all 3 to 4.20 with a 18650 charger.

@fixer2u

18 сағат бұрын

@@ivallejo1456 That is odd that it would happen again so quickly. I have had to redo mine once every couple of months not right away. There must be a couple really bad individual batteries in there.

@ivallejo1456

17 сағат бұрын

@@fixer2u the batery is nearly new. I will do the all over again to see what happens. Thanks

@fixer2u

17 сағат бұрын

@@ivallejo1456 If the battery is that new, I would suggest trying to warranty it. If you still have the receipt from when you bought it, you should be able to get it taken care of!