1. This tutorial shows the device power saving settings of your phone.
   
2. From the Display menu, select Sleep.
   
3. Adjust Sleep timing as desired.
   
4. From the Wireless & networks menu, select to turn off Bluetooth and Wi-Fi when not in use.
   
5. Turn off Location Services when not in use. From Settings, select Personal.
   
6. Select Location.
   
7. Select Off.
   
8. If you are traveling and do not have access to mobile or Wi-Fi networks, switch to Airplane mode.
   
9. From Settings, select Wireless & networks > More > Airplane mode > Off.
   
10. For additional information about charging your battery, please search tutorials for 'Charge the battery'.