Use emergency power saving mode when your device is low on battery and you still need to be able use some functions on your device.
1.
From the Settings app, scroll to and tap Battery.
2.
Tap Battery Saver.
3.
Tap or slide the Use Battery Saver switch to ON.
You can also enable Extreme Batter Saver to enable a more aggressive battery-saving mode
4.
You've completed the steps!
