Dear all,
Our fuel gauge works with LI-ION pack 20S20P or 20S10P and measuring voltage from lower 10 cells.
We were looking on forum but we cant find out what we do wrong.
Everything seems to be OK, we performed calibration and learning cycle. RC and SOC changes correctly and after some cycles SOH drop to 99% so it looks OK.
But after 19 cycles we find out that in one battery (20s20p) FCC and RC suddenly goes to 0.
Another problem is, that in other two smaller batteries (20s10p) when we charge it to max voltage (84V) FCC and RC drops 25 or 50%
first one (17 cycles):
RC = 1982 -> 1102
FCC = 2002 -> 1102
second one (14 cycles):
RC = 2003 -> 1571
FCC = 2006 -> 1571
Do you have any clue what is the reason of that behavior?
Could you look at enclosed gg file from 20s20p battery? Please change the extension of attached file to .gg.