I've had the worst experience with Milwaukee M12. I bought three 6Ah batteries in early 2022 and two 2Ah batteries. I also bought the rapid charger along with some tools (now have about 10 tools in all so I've invested in the platform). All three of my 6Ah batteries have completely refused to charge on the rapid charger for a while. I bought a 'standard' M12 charger which helped for a bit but recently my basic M12 charger died (it blows a fuse whenever plugged in) so I can't charge my 6Ah batteries at all. I'm going to try the jump start method but I'm not going to start taking them apart to try and fix them. I'm pretty gutted - probably will just sell all of the tools and invest in Makita.
Rapid charger is the problem it doesn't allow the cells to slowly absorb the charge and it amplifies the difference between cells internal resistance creating a more pronounced imbalance
The Milwaukee oscillating multi tool and rocket tower light destroy m12 batteries of all types for some reason. If you let the battery get below two bars in these items there is a good chance they will have this issue. Worst part is if you jump start or I even charge using your superior method it doesn’t really fix the problem. The internal resistance of the bad cells will continue to get bigger and higher until eventually it does this every single time.
Only one 996 because it was dropped from a great height I had to replace the outer casing. I did see 2 996 units that had to go for warranty repair though
I have one that was only a year old, and had very little use. I was getting 0V across the main 12VDC pins and then two cells were around 3.6-3.7V with the third cell giving 0.00V. I'm guessing there's a broken contact causing open circuit or else if were a short I would've seen at least around 7.5VDC on the main DC pins. It should be under warranty though so I'm not going to open the case if I can get a claim.
@@doctorlefthandthread seeing this video was the kick in the pants I needed. I filed a claim and they accepted it. The purchase date was Jan '23 and the manufactured date was sometime in '22. So no matter what, it wasn't past the 3 year warranty. I was very curious to peek inside but not enough to void the warranty since it's rare these days to get a break in your favor. Thanks.
@@doctorlefthandthread yeah they have a mail in option and you just print a label. There is a service center around 20 miles from me but that's s bit of hassle for just one M12 battery. Maybe if I was a contractor swapping out dozens of batteries, but that's not the case.
Weird. My 6.0 12V battery is at 11.35V but blinking red and green. All the batteries are at 4V. Cleaned contacts, jumped 12V to 12V battery, nothing. It’s stuck at 2 bars. I purposely drained it with a 12V compressor and put it on charge and immediately back at 2 bars and still functions.
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Thanks for the video, I had the exact same issue and tried this method to repair the battery. Worked like a charm... So far so good
Glad to help
was it necessary to remove the bottom part of the pack ,couldnt you have just balanced it from the top part where you tested the voltage?
This is my wondering as well.. also why the soldering? A bit of electrical tape on each side and a rubber band will do just fine.
There’s a resistors involved so you have to go directly onto cell.
No it has diodes in the circuit
I've had the worst experience with Milwaukee M12. I bought three 6Ah batteries in early 2022 and two 2Ah batteries. I also bought the rapid charger along with some tools (now have about 10 tools in all so I've invested in the platform). All three of my 6Ah batteries have completely refused to charge on the rapid charger for a while. I bought a 'standard' M12 charger which helped for a bit but recently my basic M12 charger died (it blows a fuse whenever plugged in) so I can't charge my 6Ah batteries at all. I'm going to try the jump start method but I'm not going to start taking them apart to try and fix them. I'm pretty gutted - probably will just sell all of the tools and invest in Makita.
Rapid charger is the problem it doesn't allow the cells to slowly absorb the charge and it amplifies the difference between cells internal resistance creating a more pronounced imbalance
The Milwaukee oscillating multi tool and rocket tower light destroy m12 batteries of all types for some reason. If you let the battery get below two bars in these items there is a good chance they will have this issue. Worst part is if you jump start or I even charge using your superior method it doesn’t really fix the problem. The internal resistance of the bad cells will continue to get bigger and higher until eventually it does this every single time.
It's an issue alright not much you can do
Add the polisher to the list. Starting to think the M12 line is a bad investment. Quality just isn’t good enough.
@@craiglyle2966 Add the M12 Shop Vac to the list. I should have bought the RYOBI tools.
@@dtsouza2519 naw ryobi is junk. they get too hot when you use them. Makita is good. Or dewalt.
this right here , my 4.0 m12 battery try was good until i used it for rocket light til it died , battery won’t charge anymore
How many of the Dewalt 996, 998 or 999 drills have you had to repair?
Only one 996 because it was dropped from a great height I had to replace the outer casing. I did see 2 996 units that had to go for warranty repair though
I have one that was only a year old, and had very little use. I was getting 0V across the main 12VDC pins and then two cells were around 3.6-3.7V with the third cell giving 0.00V. I'm guessing there's a broken contact causing open circuit or else if were a short I would've seen at least around 7.5VDC on the main DC pins. It should be under warranty though so I'm not going to open the case if I can get a claim.
A completely dead cell can stop the power coming out of the battery seen it before that cell being replaced should fix it if you don't get a warranty
@@doctorlefthandthread seeing this video was the kick in the pants I needed. I filed a claim and they accepted it. The purchase date was Jan '23 and the manufactured date was sometime in '22. So no matter what, it wasn't past the 3 year warranty. I was very curious to peek inside but not enough to void the warranty since it's rare these days to get a break in your favor. Thanks.
@@Gideon_Judges6 that's awesome glad you got it warrantied it's always the best option if possible
@@doctorlefthandthread yeah they have a mail in option and you just print a label. There is a service center around 20 miles from me but that's s bit of hassle for just one M12 battery. Maybe if I was a contractor swapping out dozens of batteries, but that's not the case.
Does it matter what type of charger is used ?
That's a lithium-ion cell charger you can use a b6 balance charger too
I dropped my 6aH now it xmas lights, anyone have an idea what the cause an fix would be? Cheers!
I would guess a broken connection you need to take it apart and check it
Weird. My 6.0 12V battery is at 11.35V but blinking red and green. All the batteries are at 4V. Cleaned contacts, jumped 12V to 12V battery, nothing. It’s stuck at 2 bars. I purposely drained it with a 12V compressor and put it on charge and immediately back at 2 bars and still functions.
Is that a knock off charger and or battery?
No.both legit
I didn’t know it doesn’t have a built in BMS inside, instead the BMS is in the charger..cleaver and more safer
LMAO it actually works 😂
Yeah it was a rip roaring sucess