I have 6 server rack style batteries. 2 of them have a weak cell and the 1 cell trips the charge MOSFET every day before it reaches full. My charge MOSFETs shut down due to that high cell, then it never turns back on while all other batteries fill and then work normally. I have to reset the BMS to get the battery to get the charge MOSFET to function again. Any help?
Are they still under warranty? If so, contact the vendor.
So what happens if you start discharging - does the BMS ever get back in the state where it accepts a charge, or only after a reset?
If the latter, to me that sounds like a bug. Normally, you would have the charge MOSFET turn off, then balancing happens until the cell drops below a reconnect value, and then the battery takes in a charge again. What rack batteries are these?