actually they have fantastic batteries

@@joshauamcdevitt7998 I 100% disagree. I've got like 16 batteries and my god, they fail so often it's actually borderline criminal. I've got two 12ah and two 9ah that all died the first season of use. For the price of those things they should last a bloody decade.

Thank you mate..

Thank you my friend... my pleasure!

My 9.0 is losing charge in like 5 min of use. Is this the same issue with yours? I don't have the individual charger tool he has.. I could purchase the balancer I guess but the other tools..

@@alainflores4075 No this is not the same issue I had. My 9.0 would not charge 2 out of the 4 cells (so even after the Milwaukee charger would be done charing and show green lights, I only had 1/2 a full battery charge). Yes, I was able to charge the 2 cells that won't charge on the Milwaukee charger with the individual charger. I spoke too soon as this did not fully solve my issue though. The problem is that now my Milwaukee charger will only charge 3 of the 4 cells (so 1 cell is sitll not charging on the Milwaukee charger). Not sure if its the battery pack itself or if it is the specific cell that is bad or what. Hope this helps. If I get that one non-charging cell issue figured out I will update.

The 9ah are the worst. I purchased 4 x when they came out. I did 5 x different warranty claims in the first 2 years before warranty expired. Now I just indudualy balance charge the cells up every once in a while.

@Bram Biesiekierski two of my 9.0 are junk as well after maybe 20 charges total.

Thank you man.. ;)

You welcome my friend..

@@EVCustoms My dear friend, I got the second equivalent card because its image is clear in the video, and the method succeeded, thanks to you... May I get a clear picture of the first card? Sorry for the poor translation from Arabic via Google

Thank you mate!

me too man.. ;) this project need time..

Best balancers is with capacitors, they have amazing accuracy...

Any recommendations or links to good balancers that I could get in the US?

What charger did you use?

@@eddieaguirre2845 It is an XTAR MC1 single lithium cell USB charger that I bought from a vape shop for about $12. It is fully automatic and shuts off completely when the charging is done.

@@SuperMurrayb and did it work? I have a milwaukee 5.0 and only the first series shows 2.5 and the other 4 series show 0.

@@eddieaguirre2845 Well, Eddie Aguirre, the procedure in the video should only be used if all of the cell voltages are over 2.5 V. With this type of cell if it drops below that voltage the cell is probably damaged and unsafe to use. If an external power supply is used to raise the voltage enough that it will charge the cell it could vent or explode at any time. Your pack is ready to recycle.

@@SuperMurrayb hi, did you get your tool working with this kind of charging, each cell?

Hi.. if you mean load balancer is 8s each, so you can make from 2s to 20s if you want..

Thank you mate! have you open this battery? check your tabs..

The symptom varied between no light and one fast blinking LED. Just before the fault the machine stopped after just a minute a couple of times (when things shaked a lot) so it makes sense.

Hi.. i am calculating max voltage of the battery 5 tmes 4.2V = 21V, so on voltage regulator regulator we must program 21V max voltage and 0.020mA charging current, for the load balancer which can hold 20mA.

@@EVCustoms Thanks for the info

;) Thank you my friend..

Hi.. after balance put your battery on charger to initialise the protection board (reset) -Milwaukee Battery boards didn't have balance mode. -Unbalanced bayteries causes from 1)high discharge rate output by power tools 2) high temperatures use and 3) absence of low voltage protection from the board.

Thanks again. Sounds like a good solution would be to put a permanent balancing socket on the battery pack and use an external balancer… Frequency of external balancing would be based on experience. Your team is a slice of inspiration!

@@EVCustoms I also think that the Milwaukee battery board does not have a balance mode. The charger stops charging when the voltage of any cell approaches 4.2V. I don't understand, such complex electronics, without BALANCER MODE???

@@Popajaja Yes is absolutely just like that, unfortunately..

Yes if you have space there, try with capacitor balance... they have perfect accuracy!

@@EVCustoms thanks 🙏, Which one is capacitor balance? Could you please put the link for me ?

After long working time period, heavy loads and most usually is from deep discharge of batteries, don't discharge them below than 3.4Volts (per cell)

This coil or inactive active balancers are so accurate.. that's why they're not stopping to balance.. try with capacitor balancers, they very accurate!

@@EVCustoms thank you for the reply. What do the lights indicate on these balencers? I assume a solid light means the circuit is active but what about the sequential flashing lights?

Hi... yes is custom made box with 300V 100A watt meter from AliExpress, PWM board with screen XY-PWM1 and 12mosfets IRF3710 in parallel (100Vdss 57A Id)

@@EVCustoms Thank you for your interest my dear friend

Hello my friend... yes! on No 3 cell you have issue, is almost empty, compare to other cells they are almost at 80% of charge. try to find only one capacitor active balancer 5S, you need just this board to balance the batteries,,,. check for dead cell on No3 parallel batteries, if there no dead cell then after balancing everything will work perfectly !

Thank you. I prefer to buy through eBay if possible. When I look on eBay I see a lot of different sellers in China that have photos of the same looking board as yours. Can you give me a link to the balancer you use from a seller in China on eBay?

Hello, I charged the battery and connected the active balance. After 7 hours the results are: 19.83. 4.11. 4.14. 3.84. 3.86. 3.85. 1-2 and 2-3 cycled through being on bright and off. 3-4 always blinked, very, very dimly. 4-5 never came on or blinked. Did I receive a bad active balancer? Thank you for your help.

They're different types. The first one (Active Balancer) is capable of dealing with larger balancing currents, so when the cell voltages a far apart, this gets them into the ballpark of being near each other fairly fast but not with great accuracy; which is where the second one comes in. The second type (Load Balancer) will balance the cells with greater accuracy, but it will take much longer to do this. Hence why he uses the one then two approach. Technically you could just use the second one, but it will take much longer to achieve cell balance than using the one then two approach.

Yes... too stressed or old battery.

@@EVCustoms does that mean I should just toss it?.. or would it be worth it to get new cells and replace them?

Yes.. recycle the old batteries and change them with new, Samsung 25R or Q30 batteries recommend

Could also be a blown fuse link (skinny section of the positive nickel strip.) I had this on one of my 9ah batteries. Or also cracked spot welds where the nickel strip's over lap. Or cracked solder joint where the main connector socket terminals connect.

@@BramBiesiekierski thanks for that info. I'm think you might be right cuz I don't think it'd be a stressed/old battery cuz it wasn't used much when it decided to fail.

Hi... yes you can do that but! you need high accuracy charger ..

Hi man.. most probably the battery will be ok.. about capacity test you will need load-capacity tester board, have any testing board something?

@@EVCustoms I have no testing equipment or experience besides standard multi meter. I ran the battery down to around 50% charge to continue storage going forward, and battery ran a leaf blower (model number 2724-20) on turbo power for about 10-15 minutes before draining to around 50% That’s the only “test” I’ve done. Not sure how much that information helps, but figured I’d mention it.

Hi.. what you mean?

@@EVCustoms how to check current capacity left in an old ebike battery.

To check how many capacity left on your ebike battery is, first of all you must balance all your batteries after that must connect some load through watt meter or amp meter and let it until the battarie discharge.

@@EVCustoms I mean you already have a kit to drain the battery and check the capacity. What is that kit and would you be able to recommend any economical device which can drain an ebike battery and we can calculate the battery capacity.

Nice idea... i will make one video with my load and meter kit..

Hi.. your strip's is ok? welded properly?

@@EVCustoms it seems to be, it's hard to tell what it looks like under the circuit board though

Hi.. you can find it on descriptions (active balancer)

Yes most probably tou must open it..

The load balancer are the last little PCB boards which i use in the video.. this boards is to achieve high accuracy voltage between batteries...

@@EVCustoms Thank you sir for your reply. I looked at the pics from the website link and couldnt find a pic that matched what you used so i just wanted to be sure to get the same thing. Im going to be greedy while i have your ear and also ask about the power supply you also used. Not trying to suck up here but must say all the videos out there me and my comrades are super impressed by you. Thanks again for all your help

@@brianb5779 Ok.... Programmable Power Supply Take cheapest one, is no matter>> www.aliexpress.com/item/32708544695.html?spm=a2g0s.9042311.0.0.27424c4dyaxcie Load Balancer choice>> www.aliexpress.com/item/32950130516.html?spm=a2g0s.9042311.0.0.27424c4d8jHrvP Active Balancer Take 5S, it will be ok for Milwaukee M18>> www.aliexpress.com/item/33002903687.html?spm=a2g0s.9042311.0.0.27424c4dHEDy0b

@@EVCustoms Sooo much appreciated Sir, thank you and i wish you the best and continuing to learn from you. Take care

This is meant to teach you the skills, why throw away a perfectly good battery, the equipment needed is less than 1/4th the cost of one new battery. look around the house at just how many rechargeable battery items the average homeowner has. it's not just Milwaukee batteries, Dewalt, Bosch etc.

Torx screws T10 and T8 I think

cause is from EU or other contra than USA. I bought a still saw from UK... the 5.0A batteries looks just like the ones here...

Underneath there is a temp sensor. Just add a heat shield of some sort.

I charge him 30euros.... its ok for this job? ;)

@@EVCustoms Not bad! Much cheaper than (half the cost of) replacing the battery!

@@EVCustoms can u send mine in I’m in Canada I’m having the same problum and I don’t wanna buy a new battery

1) Cheap Batteries 2) defective batteries in packs..

Unfortunately there didn't exist any manual or list with error codes for Milwaukee batteries..

@@EVCustomsI have one with no lightsSo I guess that has lost its program. I did disconnect it and apparently you have to keep voltage on a when changing the batteries. I have about 6 to do

​ @Allister Denyer No need keep voltages on the board when you change the batteries.. i have do that many times..

This is just my opinion, but the M18 BMS does balancing and it does work most of the time. I recently checked a bunch of my M18 batteries (1.5, 2.0, 5.0, 6.0 HO, total of 8) and their cells were within 0.01 V, which is really good considering the packs are several years old (2-3 years old) and were heavily used for a long time (I was a carpenter in Alberta, Canada, using the tools in temperatures ranging from -30 to +30). However if they do happen to get out of balance too much (whatever the underlying reason), the BMS somehow does not count with this scenario and it only gets worse from thereon. I did have a 9.0 HD battery that was acting funky and it turned out it was a similar scenario - cell #1 charged to about 60 %, cell #2 about 75 %, and the rest 100%. I would not even notice it from using the battery itself, until one day I did realize it took only an hour to fully charge the 9 Ah battery, which realistically on the OEM charger (3 A) should take roughly 3 hours. Only then I did took it apart, manually charged the first two cells and it seems to work normally now. Also worth noting is that the 9 Ah batteries are notoriously known for their unreliability (their rating on Home Depot is terrible), I wonder if it's always the case of them simply going out of balance.

I also once bought the M18 High Impact wrench (the first generation) with 4.0 batteries which are not even made anymore, and they must have been at least 6+ years old and HEAVILY used (the tool came from the Calgary's Fire Department). Even them being old, they still charged and worked well for a 4 Ah battery. Unfortunately I have not took them apart and measured them, just tried they can go through a full cycle in a M18 FUEL Skilsaw and then sold them.

No.. this will work but damage both batteries. Proper way is stated in this video, been fixing batteries for years

Sorry about that..

I am apologize...