After 100-ish cycles, the charging voltage downgraded from 17.8V to 17.6V, leading to a sharp 6% drop of battery health. The same problem occurs on 55Wh(downgraded from 17.6V to 17.4V) and 85Wh batteries as well(note the “Desired Voltage” and current voltage at 100%).
By modifying the BMS to set the charging voltage back to 17.8V(17.6V for 55Wh). We can solve the problem once and for all and slow down the battery degradation on all models no matter which mainboard you are using.