I used ectool to measure the open-circuit voltage vs remaining capacity, the battery us pretty new with only 37 cycles and the last full charge is 3971mAh(101.4%). Charge or discharge to a certain percentage and stay there for 10 minutes, measure the voltage, change the charge limit, repeat.

%, remaining capacity, open-circuit voltage

91%, 3618mAh, 17312mV

80%, 3180mAh, 16742mV

70%, 2782mAh, 16310mV

60%, 2387mAh, 15876mV

50%, 1988mAh, 15518mV

40%, 1589mAh, 15283mV

30%, 1194mAh, 15134mV

20%, 795mAh, 14959mV

30%, 1194mAh, 15209mV

40%, 1589mAh, 15396mV

50%, 1986mAh, 15640mV

60%, 2384mAh, 16011mV

70%, 2783mAh, 16460mV

80%, 3178mAh, 16838mV

91%, 3618mAh, 17331mV

100%, 3972mAh, 17784mV

Note: thereâs no 0~20% as the EC does not allow chargelimit that low, and without this itâs a bit hard to measure open-circuit voltage. I chose 91% is because 3572/3915=91%, if the open circuit voltage is at 17.3V (limited charging voltage is slightly higher as the voltage will drop after charging completion due to internal resistance), then the 61W batterpack is like an âunlocked CPUâ compared to 55Wh if the dischrage curve is identical from 0 to 3562mAh, but Iâm not pretty sure.