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Follow the instructions below
1 Open your device's Settings app. Tap "Battery."
2 Tap the menu with three dots at the top right of your screen, then tap "Battery saver."
3 At the top of your screen, set the switch to 'on'. The top and bottom of your screen will turn orange when battery saver is turned on.
4 To turn on battery saver automatically when your battery is low, tap "Turn on automatically" and select "at 5% battery" or "at 15% battery."

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