My Ryobi power tools do the same thing.
The charger also goes into maintenance mode after a charge and monitors the battery.
You can leave the battery in the charger and plugged in indefinitely.
Believe me, if you make a campfire to cook a hot dog during a total fire ban or try to fit pvc pipe together with an oxy torch you will be held responsible.
Both of those idiots caused major fires near my home. Property was destroyed and lives were lost. I leave it to your imagination what I’ll do to either of them if I find them.