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 and device care.
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Press Battery.
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Press Power saving mode.
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Press the indicators next to the required settings.
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Press the indicator below "Power saving mode" to turn on the function.