If you have multimeter read voltage on 5th and 6th pin of the M92 chip. should be 3-5v charger plugged in.
Check caps near BQ on shorts without a battery connected.
I had 0amps on charge when BQ is completely dead, usually it burns a fuse also.
Check battery voltage when it's plugged in to the switch and it's works, check voltage on battery unplugged, it might be a controller inside of the battery itself, try other one of u have it.
There are resistors right on top of the BQ those are might be faulty also, check if u can read resistance across all of them. Be aware that in circuit they might have different readings +-.