What's wrong with my Milwaukee battery? This is the answer 

Thanks for your comment it helps

Thanks

It seems a waste to toss a battery that only needs 2 cells. I haven't had a powerstack torn down yet it will be interesting to see if they are serviceable down the road.

@@doctorlefthandthread I opened one up. Pouches encased in a shitty plastic. Didn’t want to tear into it and mess it up

@@IMPACT-NATION probably wise

@@Brandyonfire in that case I just get a knockoff board cheap and replace it

Never in my 12 years I replaced or threw away a milwaukee battery I have 12 batteries from 2.0 to 12.0s

@@817aqqtown just replaced 2 4amp and a 5amp through warranty... They don't last long in UK

The cells that are showing nearly zero voltage need to be replaced. The board could be ok but unless you balance the cells the original board won't work. The knock off board will let the battery work with the cells out if balance but cells being as close to equal voltage is recommended.

@@doctorlefthandthread Thank you so much for your help. I already have the two bad cells out and I plan on getting the small spot welder, the two new cells, and some strips of pure nickel so I can fix the battery as soon as possible. 👍🏼

@@joshhibbs_nola great 👍

You can sometimes you need to replace the pcb too

@@doctorlefthandthread yes those 3Ah one are very bad i seen many many bad Samsung 15M cells they switched to different cells in the latest model same as those 9Ah m18 that they stop making them Samsung 30Q and bad board same in m12 3Ah and 6Ah that they switch to Sony VTC 6 after 2021 december

@@TranTek good information thanks

My guess would be that you need to replace the board as well

Get rid of.the crappy charger and get yourself an adjustable power source. The one I got cost me about 70$ and I can adjust it from 0v to 30v with 10amps of current. I set it to 21v and hook up the alligator clamps to the battery and charge it the dummy way. Get a multi meter to test voltage (fluke 107) if it's below 16v the cells in your battery are junk. You can either solder new ones on or junk it.

@@johndowe7003 you are correct since the creation of this video 5 months ago I have acquired a dc desktop power supply and a better multimeter. Thanks for your advice and comment.

What's going on is the batteries that he's saying are bad cells are only "bad" because they weren't balanced charged correctly by the board and charger. That does indicate a problem but if you check each individual cell and some will have full charge and some have a low charge you can bring those low charge cells back up and individually balance the cells yourself. If the individual cell reads zero and does not take any kind of charge it is bad or if the individual cell has flipped and reverse polarity it is then usually bad as well and cannot be salvaged. That is common in the Black & Decker lithium batteries, the board is so dumb it doesn't balance charge and it allows you to run the battery until some of the cells are completely depleted while other cells still have a bit of a charge. This causes one or two of the cells to reverse polarity and it will act like a connection break in the battery. Anyway, you will want them all to say as close to the same voltage as possible for them to be balanced and work correctly and charge correctly. If you individually charge them and get them all to read close to the same you will then have a working battery but something is or had caused them to go unbalanced and more than likely they will eventually get unbalanced again. Requiring additional work or replacement it could be the cells themselves and that they aren't charging at the same rate or it could be the board not applying the same amount of charge to each group of cells. If a person decides to change out the low cells instead of just charging them up individually, you can still use them in a flashlight since they do still work. I'm trying to figure out why one of my batteries says green on the charger like it has full charge and when tested it in fact does have full charge and balanced even, but when pressing the charge indicator the light blinks or flashes red it supplies no power to the tool. I'm pretty sure it's a faulty board, I'm looking to see if somebody's figured out the repair.

@@SS-zm3vi we've already figured out the repair lol just remove the cells (8200 series cells) and install good ones. Then dummy charge the battery, those Milwaukee chargers are garbage. I check batteries use ng voltage only. 21 full 16 dead

It is the genuine article

@@doctorlefthandthread no disrespect but it only looks like the fakes on Ebay.

@@rickyperkins232 its all good thanks for your comment

Maybe you could clue me in instead of a less than flattering comment

Glad to help