Turn Off Background App Refresh : Some apps never sleep. Go to Settings > General > Background App Refresh and disable any unnecessary options.
Use Low Power Mode Smartly : Low Power Mode isn’t just for emergencies. Turn it on when you’re down to 30–40 percent to extend the battery life.
Disable Location Services for Non-Essential Apps : GPS sucking the battery away. Go to Settings > Privacy > Location Services and restrict only essential apps.
Reduce Brightness and Auto-Lock Time : This display is bright and can drain the battery. Keep brightness below 50%, dim it, and set Auto-Lock to 30 seconds.
Avoid Full Cycles Daily : Charging the battery from 20 to 80 percent does not deplete its health as much as charging it from zero to 100 percent.