Battery percentage

Suddenly my Lenovo Ideapad S340 started showing 99% battery percentage all the time. I guess this happened after a recent update. Anyone else who have this problem and if possible know about a solution?
I have Mate Ubuntu 22.04 version.

I can now report that suddenly the battery percentage started to decrease after staying at 99% for over 1 hour. This is not normal behaviour, i will see what happens after next charge.