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You can have the Battery saver mode automatically turned on when the main battery gets
low. This mode will limit the use of location services, vibration and most background
processing data. On Battery screen, tap on More and then select āBattery saverā.
Switch on the function and choose when to have this mode automatically activated. After
this function is enabled, the title bar of your screen will turn orange.
Note:
This mode will automatically become inactive when your device is being charged.