Milwaukee warrantees their batteries for 3-5 years. Send them in.

There are many videos on KZfaq showing the fix. I'm doing it myself. It's a pain but these packs are $$$ so we're motivated. Just takes a $40 LiOn battery charger and two wires.

I had the same problem with Dewalt batteries, I don't use them daily and they can sit for a month at at time. Out of 9 batteries bought in 2021, only two are 100%. I started to buy and adapt the cheap Harbor Freight batteries to my Dewalt and Snap On tools. Although they don't have the run time that the name brand batteries have they don't seem to degrade as bad when they sit. If they do, they're cheap enough to just toss and replace.

6s SOMETIMES, but 8s and 12s are notorious for dropping a cell. Easy enough to repair but yeah. Suckksss. Quite a few if my 8s are "3 barrers" lol. Tbeyre fine enough. Ive fuxed a few others but quit messing with them. Just started investing in 6.0s and 3s which work excellent in Heavy Diesel Dealership setting for me. Good luck Nappy

You should buy only enough batteries that will give you 18 hours of run time, unless you intend to work 24/7. Thats too many batteries . Buy more as you need more.

yes, Take it to the milwaukee service center and get them replace as soon as you can make sure they are under warranty those batch has bad defective cells the early version of Samsung 40T some cells sag latest version of Samsung 40T version 3 seems to solve some of this issue Milwaukee should recall them all they switched to Murata cells which awesome but bad board causing them not able to charge

That Amazon special right there boiz 😅

Drain them down and full charge them again,do that about 2 or 3 times to retrain the cells in the pack,lithium has memory,it's not just the electronics in the batter but the actual lithium does as well.

Take it to the milwaukee service center and get them replace as soon as you can make sure they are under warranty those batch has bad defective cells the early version of Samsung 40T some cells sag latest version of Samsung 40T version 3 seems to solve some of this issue

Once you cycle them a couple times it will come back

Makita don't give me this problem and I still have my first battery since 2014

will the ink on your receipt still exist?

Yea the 12ah batteries suck. They have balancing issues

I have this same problem with mine after just 2 years and minimal cycles.

Good info 👍 👌

Mine 12.0 didnt even last a year

Plug-ins NEVER have that problem

Yeah milwaukee been going down hill.

I got fed up and left milwaukee started picking up dewalt and never looked back😂 what dewalt is pushing is making them milwaukees feel like a craftsman. Especially there 60v line. Iv got about 7 flexvolts 2 of each 1.7 and 5 amp powerstacks regular 4, 5, and 6 amp xr and have never had this dumb ass issue agian or the battery not charging at all if the the tool didnt fail too

Your cells are unbalanced very common in higher ah batteries. All brands easy fix for me

Never buy one per tool you tool. You can’t use 200 at once

DeWalt baby! My three year old batteries are like new.

You need the super charger

Bad cell, had a 9ah flexvolt did the same thing. The cells dont balance during charging for some reason, "full charge" was at 17.6 volts with 2 of 3 indicators lighting up. It seems to be common with 3p batteries for some reason. Hopefully you get a resolution with these, my 9ah fv was cycled maybe 4 times when my cell dropped.