To add to the very good advise from Both previous Contributors - bravo to both.
A feature introduced into Big Sur & Monterey, Ventura, Sonoma was to preserve the number of Full Battery Cycles - there was an Algorithm coded into the macOS.
It is perfectly Normal for Big Sur , Monterey, Ventura, Sonoma to Pause / Suspend charging the battery beyond 80% and hold it at that level.
One can nudge / over-ride this by clicking the Battery Icon on Desktop Top Bar and allow charging beyond 80%.
From observations, it will Pause / Suspend again once reading 90%. Same procedure to over-ride and will charge to 100%
In my experience - the Apple Algorithm is sometimes a " Slow Leaners "
Have personally experienced where it took 3 - 4 Months before the Algorithm had learned enough of my computer usages before it Kick In.
Below is from an Old 13" Retina MBA with Intel Processor
Noting the " Charging On Hold (Rarely Used On Battery) "
Batteries needs exercise to keep chemicals in the battery healthy and do what they do
