1. You can use the Usage Manager to determine what apps and features are consuming battery power. Tap Apps > AT&T folder > Ussage Manager > Battery.
   
2. To turn on the battery saving features of your device, from the home screen, swipe down from the top of the screen and tap the Settings icon.
   
3. Under the System tab, tap Battery.
   
4. Tap Power saving mode.
   
5. You can prolong battery life with modes that save power.  Tap the Power saving mode toggle to turn on Power saving mode.
   
6. If you scroll down to Recent battery usage from Battery, you can view which applications are using the most battery power.
   
7. To change the Brightness on your device, swipe down from the top of the screen and use the slider to adjust as desired.
   
8. To set the screen timeout to a shorter duration, tap Settings icon > Device > Display > Screen timeout > select desired time.
   
9. To turn Location Services & GPS on or off, swipe down from the top of the screen and tap Location.
   
10. To turn off auto-update apps, tap Play Store > menu icon > Settings > Auto-update apps.
    
11. To turn off auto-sync, swipe down from the top of the screen and tap the Expand icon.
    
12. Then tap Sync.
    
13. If you are traveling and do not have access to mobile or Wi-Fi networks, switch to Airplane mode.
    Note: To turn aurplane mode on or off, swipe down from the top of the screen, tap the Expand icon, then tap Airplane mode.
    
14. Turn off Bluetooth & Wi-Fi when not in use by swiping down from the top of the screen.
    
15. Tap Bluetooth & Wi-Fi to turn on or off. 
    Note: For additional information about charging your battery, please search tutorials for "Charge the battery".