Power saver mode helps to increase battery life.
It reduces the usage of phone features that drain the battery such as location services and mobile data.
Home screen, swipe up and then find and tap
- Tap Battery.
Tap the Power saver
On/Off switch to turn power saver mode on or off.
To set when to automatically switch this mode on, tap Power saver, select the Automatically turn on power saver when battery life is below the level I specify option, and then select a battery level.