Hey Guys,
Got this new 20S 20Ah pack built from brand new Samsung 25R cells and the pack came out of balance.
Opened the pack, charged it all the way to the top, then waited for all the BMS channels's blue leds to turn off (lit on led means bleeding down a channel/balancing) and after a few hours when all the lights turned off I measured all the cell rows and got half of the cells at about 4.16V and half of the cells at about 4.09 and one cell was even 4.06V
This is after I changed to a different BMS from the same supplier (exact same model) and it did the same.
I work with this BMS supplier for over a year with no problems.
Is it possible that the BMS is faulty or the balance is too far out for the BMS to balance easily and it will take it too many cycles to balance if ever?
btw, once the charger finished charging and goes to idle mode, does it matter that I disconnect it or does it sometimes draw a bit of current for the balance? because it seems that balance is only happening downwards by bleeding cells down.
I want to avoid manual balance and then giving the pack back and have this happen again.
Got this new 20S 20Ah pack built from brand new Samsung 25R cells and the pack came out of balance.
Opened the pack, charged it all the way to the top, then waited for all the BMS channels's blue leds to turn off (lit on led means bleeding down a channel/balancing) and after a few hours when all the lights turned off I measured all the cell rows and got half of the cells at about 4.16V and half of the cells at about 4.09 and one cell was even 4.06V
This is after I changed to a different BMS from the same supplier (exact same model) and it did the same.
I work with this BMS supplier for over a year with no problems.
Is it possible that the BMS is faulty or the balance is too far out for the BMS to balance easily and it will take it too many cycles to balance if ever?
btw, once the charger finished charging and goes to idle mode, does it matter that I disconnect it or does it sometimes draw a bit of current for the balance? because it seems that balance is only happening downwards by bleeding cells down.
I want to avoid manual balance and then giving the pack back and have this happen again.