battery health 98%

I have a MacBook Pro m1 16 inch and I use it for one month just for web surfing and programing. suddenly in the last week the battery dropped to 98%

I think that's not normal because I have a MacBook from 2016 and I was using it in the same way thing but the battery health is 81%. now that's normal. "I use the last macOS update Ventura 13.6"