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.
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Slide two fingers downwards starting from the top of the screen.
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Press the settings icon.
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Press Battery.
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Press Battery Saver.
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Press the required settings to turn them on or off.
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Press the indicator next to "Use Battery Saver" to turn on the function.
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Slide your finger upwards starting from the bottom of the screen to return to the home screen.