1. This tutorial shows the device power saving settings of your phone.
   
2. From the Display menu, adjust Brightness to adjust the brightness of your screen. 
   
3. From the Connections menu, select to turn off Bluetooth when not in use.
   
4. If you are traveling and do not have access to mobile or Wi-Fi networks, switch to Airplane mode.
   
5. For additional information about charging your battery, please search tutorials for 'Charge the battery'.