In times when you don't need to use much of your phone, turn Extreme power saving mode on to extend battery life longer.
In this mode, standby time can last longer than usual, and you can only use the most basic functions such as phone calls, text messaging, and email.
Go to Settings, and then tap
Tap the Extreme power saving mode
On/Off switch to turn extreme power saving mode on or off.
If you want to set when to automatically switch this mode on, tap
Extreme power saving mode and select a battery level.