In my case the switch took a bath, not sure how long ago.
I took it apart and gave it an alcohol bath for half a day. Give it a good brush scrubbing.
Put everything together and was stuck at 0.41 charging for a whole day. There’s no short and battery is charging. Did test with new battery same result. Back light was on too. Every so often I notice the back light flicker from disconnecting battery n putting it together.
Tested without connecting backlight and it charges like normal , drop to 0 and then fast charge. Connecting the backlight again I get the constant 0.41 charge
Will replace the connector when I have a chance n update here