Power Saver mode

If the battery charge level drops to low levels, the phone automatically activates Power Saver mode to conserve battery power until you can recharge it. You can set the phone to activate Power Saver mode at 10%, 20%, 30%, 50%, 70%, or Immediately. From the Home screen, tap the Apps Key > Settings > Power saver. When the battery charge is low, a notification is displayed prompting you to turn on Power Saver.