Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusing

[sam_sam_sam]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

I took advantage of the the sale that they have on these batteries I bought 30 of them to replace the old cells in the two battery packs that are having the issue with the unbalanced battery cells

The sale ends at midnight

[sam_sam_sam]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

I answered the question about discharging the battery cells down to 3 volts and letting the Milwaukee battery charger to recharge the battery pack

Unfortunately it does the same exact thing again it only gets to 3 out of 4 LEDs lights up some of the battery cells are not working correctly anymore so it time to dismantle the battery packs and put new battery cells in them

I did not have much hope for this to really work but it was the simplest thing to try first and I now know the answer to this question of weather or not it would work

STJ in the description of these after market Milwaukee battery pack board plastic case battery holder plastic case dose it say 21700 batteries holder in it does not mention what size that they take

So I suspect that they are the 18650 battery holders which I did find out from a YouTube video that the HD12 amp battery pack does use the 21700 batteries in this series

[sam_sam_sam]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

Yes I know that these are not BMS balancing protection boards but you did answer my question the ones that I have seen on eBay are the lower amp hour battery packs not the higher powered boards they are a little different here is a picture of a 12 amp hour battery pack BMS protection board also here a side picture of the end of the battery cells

[stj]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

the BMS boards are all crap - all of them including milwalkee
they dont actually balance anything, they just monitor the state and stop charge when they go out of balance.

[sam_sam_sam]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

I have one group of battery cells that I have to bring down to 3 volts and then put it on the power tool charger and let see what happens when this

[sam_sam_sam]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

I would use 21700 but able to find good quality ones and only a few on eBay

I did a Google search and found these and they do take PayPal

https://www.18650batterystore.com/pr...SABEgJelvD_BwE

According to the website these batteries are made in “Republic of Korea” they are sometimes hit and miss in quality
But I going to give them a try because right now they have a sale on them 15 of them would be $65.25

But STJ do the Chinese made BMS protection board are they any good and will the Milwaukee battery chargers work with them or would you have all kinds of issues

I have seen them on eBay and wonder if they would be a good option or not

[stj]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

are they 18650?

the chinese are selling shells and boards on ali that let you use bigger cells now like 21700's

[sam_sam_sam]

Re: Milwaukee M18 HD12.0 (12 amp hour battery pack) unbalanced failure charger refusi

Well on one battery cell grouping the amp hour rating is going to be very close to 12 amp hour but the other battery cells are coming in at over 5.something amp hour so lets see if discharging to 3 volts and letting the tool battery charger recharge the battery pack and see if it improves or not

But it the same exact thing about 3.6 to 4.0 volts voltage range in the second battery pack as well

At this point I do not know if these battery packs are to still be any good and are just showing there age

[sam_sam_sam]

I have two Milwaukee 12 amp hours battery packs that have an issue with battery cells very unbalanced these are probably over 4 years old and been heavily used in the past but now get occasionally used heavily and when I went to use the grinder tool the battery lost battery battery power very quickly so I decided to open it up and found some battery cells voltage from 3.6 to 4.1 no wonder the battery charger was not fully charging them 3 out of 4 LEDs were on meaning that it was only 75% charged

So I have put them on the battery testing machine to drain each battery cell down to 3.0 volts and let battery charger for the tool do the charging cycle again and see if it will fully charge this time around or if not then I will hunting down replacement battery cells that high amp battery cells made for power tool

Because these battery packs have really gone up in price I have only bought one new battery pack because of the price

Home Depot in the past has had a special buy where you get two battery packs
For what I paid for one battery pack that I bought today

The 12 amp hour battery pack is the most expensive battery pack that they sell for the Milwaukee
Yes I could have bought the 6 amp hour battery packs but even these do not have a special buy on these either come to think of it only the M12 battery packs are the only one that they have the dual battery packs special available right now I buy another set because they have a tool except tax free week in Florida this week so I might just take advantage of this