Hilti Battery B22 4.0 blink green but not responding

[bohaboha]

The HILTI CPC battery flashes green but no tool starts or works. when testing the battery has 19.2v what could be the problem with them because I have three similar ones but there is nothing written on them all the patches are removed in the first B22 /4.0 with 19.2v the second one B22 /5.2 with 21.8v the third B22 /4.0 with18.3v are all three destroyed ? a bit difficult to believe have also tried other Hilti tools the same thing if someone who can help very grateful

[stj]

what voltage are they supposed to be?
did you try putting a load on them like some lamps?
you need to get into them and meter the individual cells

[bohaboha]

Hi stj i do not know but i read they suppose to be around 22v .i did not try anything cause i do not know about batteries
hope someone here can give a direction like you are doing thank you

[stj]

sam_sam_sam will help

[bohaboha]

yes hope sam_sam_sam will read this

[bohaboha]

Have opened the battery, there are 6 cell and one through encapsulated BMS that you can not do anything on that cells are quite unbalanced, 3 cell with 3.2v the others are at 2.7v ,2.4v and 2.5v it is a bit strange that they are so low, I don't think it is enough to balance them except have to see what is not right

[stj]

thats just an effect of age/lots of cycles.
the board is not really a BMS, it's more of a protection/anti-fire device.
try charging all the cells to the same level individually using jump-wires and maybe a tp4057 based charge module if you dont have something clever like a B6

[bohaboha]

Yes it can be age and many cycles. but i am a bit a suspicious about "BMS" because i heard and read that a good drill battery should have a good active balance function on the BMS and wat you say let me think a bit.no i do not have a B6 but i have a single 1850 charger that i can use with jump-wires and multimeter to control the process
one question how high v level can i charge them? if you like to have a better idea about this read this :https://www.eevblog.com/forum/repair...59/#msg5309959

[stj]

just fully charge each cell with the charger - it will be about 4.3v without a load

[bohaboha]

where are you sam_sam_sam

[Maxim GRI-welder]

The HILTI CPC battery flashes green but no tool starts or works. .....
... a bit difficult to believe have also tried other Hilti tools the same thing if someone who can help very grateful

The first thing you need to do is open the battery case.🙂

Then check the voltage on all cells. If they are not equal to each other, then rebalance with some device (such as imax) or manually on each cell to a single voltage.

Then you need to disconnect the protection board and clean the contacts that connect it to the cells. I would advise then, when reattaching the board, either solder these contacts or weld them with spot welding.

After that comes the most important point. Most likely, you will have one LED on the indicator blinking the same way as before, and native charging will not charge the battery.

Next (don't be surprised) You need to wet your finger and touch it in such a way that it connects the positive contact at the battery outlet and the contact to the right of it.
After that, the indicator will start showing the voltage to which the battery is charged. I talked about it (though in Russian) in this video:
https://youtu.be/TVYLEUM5D6w?t=10m51s

[Maxim GRI-welder]

[bohaboha]

The first thing you need to do is open the battery case.🙂

Then check the voltage on all cells. If they are not equal to each other, then rebalance with some device (such as imax) or manually on each cell to a single voltage.

Then you need to disconnect the protection board and clean the contacts that connect it to the cells. I would advise then, when reattaching the board, either solder these contacts or weld them with spot welding.

After that comes the most important point. Most likely, you will have one LED on the indicator blinking the same way as before, and native charging will not charge the battery.

Next (don't be surprised) You need to wet your finger and touch it in such a way that it connects the positive contact at the battery outlet and the contact to the right of it.
After that, the indicator will start showing the voltage to which the battery is charged. I talked about it (though in Russian) in this video:
https://youtu.be/TVYLEUM5D6w?t=10m51s

-thank you very much i just put everything to the side but now i ll look at it again after i see your video