Since you have your laptop covered by warranty, contact support@chuwi.com and store@chuwi.com and present the details of your case so they can activate warranty and change battery.
Got the same laptop June 2021 and the same issues about a month ago.
The laptop is now in Spain (official Chuwi facility) for servicing after contacting support.
I had the same problem. Contacted support@chuwi.com, got a new battery under warranty and installed it. Now the laptop is in perfect condition again, and I didn’t have to send it anywhere for service.
Odd, I did the very same (I was worried about shipping an inflated battery) but was told by support they cannot ship bare batteries so I sent the unit in Spain for servicing.
Anyway I got my laptop back yesterday in pristine conditions.