Battery saver helps extend battery life until your next charge. Your phone can prompt you to activate it when the battery is low, but you can turn it on manually at any time or set a schedule to turn it on.
You can choose between Standard battery saver and Maximum battery saver. Standard battery saver reduces background activity and limits some features, while Maximum battery saver restricts much more—it disables most apps, limits functionality, and turns app icons gray to show they're paused.
Battery saver turns off while your phone is charging. It turns back on when you unplug the phone.
Open quick settings and tap 
You can turn Battery saver on automatically when it reaches a specific percentage. Or you can let AI learn your behavior and limit background apps when your phone is inactive.

To specify a percentage:


To prevent your phone from turning Battery saver on before you need it, you can set it to turn off when your phone is charged to 90% or above:




