HOW TO Reduce power consumption
1 Background app refresh
Navigate to Settings > General > Background App Refresh. Tap On to switch it off, or restrict its use to Wi– Fi only. You can also scroll down and prevent unused apps from draining your battery without having to remove them.
2 GPS usage
Go to Settings > Privacy > Location Services. Set individual apps to Never or “While Using the App,” and review System Services too. Go to Privacy > Bluetooth to review (and block) apps that are using your Bluetooth.
3 Wi–Fi over mobile
Whenever you have the option of Wi–Fi for your connection, disable your mobile internet connection, which uses far more power. In poor signal areas, enable Airplane Mode to avoid wasting energy looking for a connection.