help me - Nova Boox Onyx battery problems

[anonimiser]

Hi, I have a weird battery problem with my device. The battery works normally when I am using it but when I power it off and left it that way for several hours it drops to 0. Like it was turned on the whole time.

First 2 times I thought that it was an accident or maybe something about a magnetic cover but it happened again when I left it completely alone.

I bought it back in 2022, it was working fine ever since. Even when I am using it the battery drains normally.

It's so annoying, should I replace a battery or is it some software glitch?