After long time seching- the solotion is to recalibratin the batery.
Here's how to do battery recalibration.
I , just go into BIOS setting by pressing ‘Esc’ key when Chuwi chinese writing logo appear when booting,
left it on for approx 45 min until it powered off because battery is completely drained.
Then charge it (tablet stays off) until 8-9 hours.
Hope it will help
Sorry to tell you It worked only one time
Steel have a charging problem