From the Settings app, scroll to Display.
Tap Display.
Tap Screen timeout.
Select your preferred screen timeout duration.
Decrease the screen timeout to help extend your phone's battery life.
Swipe from the left or right edge of the screen.
Tap Brightness level.
Select your preferred brightness level.
Lowering the screen's brightness can help to extend your phone's battery life.
Tap anywhere outside of the Brightness Level slider to save your changes.
You've completed the steps!
