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Some functions on your phone use a lot of power and therefore significantly reduce the battery life. You can reduce the power consumption by turning on low power mode.
1. Find "Battery"
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
2. Extend the battery life
Press Battery Saver.
Press Turn on now to turn on the function.
3. Return to the home screen
Slide your finger upwards starting from the bottom of the screen to return to the home screen.