Changing the length of time before the lock screen shows up, known as screen timeout, and brightness of your device can impact your battery life. Decreasing the time of inactivity before your device goes to sleep and lowering the brightness of your device can help extend your device's battery life.
1.
From Settings, tap Display.
2.
Tap Screen timeout.
3.
Select your preferred screen timeout duration.
4.
Tap Back.
5.
Tap Brightness level.
6.
Select your preferred brightness level.
Lowering the screen's brightness can help to extend your phone's battery life.
7.
You've completed the steps!
