How to improve iPhone battery life
* Enable Auto-Brightness from Settings-Display & Brightness. * Turn off location services for some system services. You can find it in Settings-Privacy-Location Services-System Services. My current setting is in the picture. * Turn Bluetooth off when you are not using it. * Enable notifications only for those apps that needs your immediate attention. * Turn off “Background App Refresh” from Settings-General. Hope this helps. Thanks.