Lii500 or Opus 3100 v2.2

[SIGShooter]

Another fix:

OPUS BT-C100 - 0.05V ERROR FIX for LiIon charging

Some have received this charger and found, like HKJ’s test shows, that the voltage display (at least for LiIon cells) is 0.05V too high. The result is that charging stops at appr. 4.15V. This is easily fixed as the case can be opened by 4 screws. Hold the charger with the display against yourself (south) and rotate so the backside comes up. Inside, the PCB is fixed by 2 screws (DO NOT UNSCREW!). 1/4” south of the LEFT screw you find two resistors R63 (01B=1k) and R64(302=3k). Simply solder a …