iPhone 12 Pro
My phone's battery life is short
Solution 8 of 14: Low Power Mode has been turned off
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.
Press Settings.
Press Battery.
Press the indicator next to "Low Power Mode" to turn on the function.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.