Is It Bad To Keep Apple Watch On Charger. Absolutely it is OK to leave the Apple Watch charging overnight. When the battery reaches 100 it no longer charges and it will only accept what charge it needs to stay at 100.

If your Apple Watch is getting older and none of these suggestions works it might be time to purchase a new wearable device. Give your Apple Watch time to charge. Unoptimized settings software crashes and heavy apps can all cause significant Apple Watch battery drain.
If your Apple Watch still wont charge force it to restart.
Modern charging systems and batteries dont have issues with overcharging. Charing an Apple Watch is made super easy thanks to the magnetic charging properties of new Apple products. Basically once it reaches 100 it stops charging and waits until it drops 1-2 and then slowly trickle charges it back to 100. It is not possible to turn the watch off whilst it is on the charger and connected to power - this is normal.

