Boost Your Android Phone’s Battery Life
1. Keep an eye on signal strength.
2. Reduce email, Twitter, and Facebook polling
3. Turn unnecessary hardware radios off
4. Use the extra power saving mode if you have it.
5. Trim apps running in the background
6. Dump unnecessary home screen widgets and live wallpaper.
7. Turn down the brightness and turn off Automatic Brightness.
8. Update your apps.