I agree that this is most annoying. Surely the cells cannot recover to ‘full’ voltage overnight ? Would love to hear feedback on this. So this makes me think that the BMS calculates remaining capacity totally based on the voltage sum of the cells and does not keep track of actual current over time. I use , in conjunction with the BMS , a coulomb meter with a proper shunt and that indicates the SOC where it left off when discharge was stopped.
Which meter are you using?