- Turn M5StickC off
- Remove USB C from M5StickC. (If plugged.)
- Connect BAT and GND pins together with a jumper wire (male to male).
- Plug USB C into M5StickC and finally ...
- Remove immediately jumper wire.
Your M5StickC will now work as expected !
Do this every time M5StickC battery is drained because of bad HW design. :-(