Alrighty... done some more testing and have info to report.
Since replacing the dead cell, cycling the entire pack a dozen times to 25~50% dod..
- If i leave the BMS plugged in with the ballance leads and the + and - leads hooked up to the pack, cell no.24 gets drained significantly ( like 1 ah over 48 hrs )
- If i leave the ballance leads plugged in but not the + and - everything is ok.
Something strange i've observed is that chanel 24 will start to flicker faintly when the pack is just starting to ballance but cell 24 is still at the 3.4xx volts, the other chanels only start to flicker when cells get to 3.6xx volts
I checked resistance of all chanels ( BMS not connected to pack ) and get 250k on all 24 ( This is version 2.3 of the board btw )
When charging with the BMS i am using a combination of a 48v power supply and a 36v LFP charger in series, the lfp charger limits current to 2 amps and total voltage of them in series gives 96v, if i boost cell 24 with a single cell charger the BMS will go on green and shut down as expected.
sooo.. that's where i'm at. any ideas ?