How to thrifty smartphone battery
1. Level the brightness of screen to the darkest as much as we can use them comfortably.
2. Turn off vibration, It will preserve battery life.
3. Set the screen saver at 15-30 seconds,the low setting is better.
4. Switch off GPS,Bluetooth,3G,4G,Wifi whenever not in use.
5. Close unused applications every times when you stop using.