Battery mot charging past 54%

[dsimic]

I left the phone charging for more than 24h and this issue seems to be gone. I don't know how to replicate it. But now when the phone reaches ~90% it starts discharging, although the cable is still plugged in.

It's a bit strange that the battery initially didn't charge past 54%, but let's grudgingly accept that it got resolved spontaneously.  Maybe the battery needed some time to start accepting full charge, although it's still a bit strange.

Stopping the battery charging around 87-90% is the expected behavior, as it improves the longevity of the battery.  Also, that prevents the battery from overheating while charging, although there's very small possibility for the overheating in the first place.