Low Power Mode activates automatically when your iPhone or iPad is low (like at 20%), but you can also manually enable the setting.
Open Control Center. If your phone or tablet has Face ID, swipe down from the top right corner of the screen. If your phone or tablet has Touch ID, swipe up from the bottom of the screen. Tap the battery icon. When the tile turns white and the battery turns yellow, you’ll know that Low Power Mode is enabled. Tap the battery icon again at any time to turn off Low Power Mode.
Your screen’s auto lock time will reduce to 30 seconds. 5G will be disabled (except for video streaming). Email fetch will not occur in the background. Background app refresh will be disabled, so you won’t get push notifications from apps like Facebook, Instagram, or Twitter when they are minimized. Your display brightness will decrease. Automatic downloads will be suspended. Some visual effects, like live wallpapers, will be reduced. iCloud Photos will not sync in the background. Once your iPhone or iPad reaches 80% charge, it will automatically disable Low Power Mode. [1] X Research source
