Use Focus to Avoid Notifications
Getting notifications constantly is a pretty common way of draining your battery. After all, having your Apple Watch vibrating, making sounds, and lightning up all consume power.
You can either disable notifications for certain apps or start using Focus mode so your watch isn’t constantly vibrating.
To use a Focus mode, all you need to do is press the Side button on your Apple Watch and tap the Focus button (it’s the one with the icon of a moon). Then, choose the Focus mode you want to use and tap on On.
Keep in mind that turning on Focus mode on your Apple Watch will also enable it on your iPhone and other Apple devices that share the same Apple ID.