Turn on battery saver
If your device is low on battery power, you can turn on battery saver to limit features that use the most power, such as
vibration, location services, and data services. You can set battery saver to turn on automatically when your battery power
reaches a certain percentage.
Note: When battery saver is turned on, some applications and messaging services that rely on syncing might not update
unless you open them.
In the device settings, tap Battery > > Battery saver.
Turn on the switch.
To turn on battery saver automatically when your device is low on battery power, tap Turn on automatically. Tap a