There are different features such as watching YouTube, listening to music, programs running in the background, using Wi-Fi and Bluetooth®, constantly synchronizing e-mail that can drain the battery quickly.
To improve battery life, refer to the following information:
When your device is not in use, press the Power button to switch off the screen. You can also select a shorter idle time before the phone screen switches off and lower the screen brightness.
To do this from the Home screen, go to Menu>Settings>Display and then change your Brightness and Screen timeout settings.
Use the AC adapter to plug your device into an external power outlet whenever possible.
Turn Bluetooth and Wi-Fi off when you are not using it. To do this from the Home screen, go to Menu >Settings>Wireless & Networks and uncheck Bluetooth and Wi-Fi.
Turn off your phone connection to GPS satellites when not in use. To do this from the Home screen, go to Menu>Settings>Location then uncheck Use GPS Satelites.
Note: For quicker access to enable/disable Wi-Fi, GPS, Bluetooth, etc, touch and hold on the Home Screen, select Widget and then select Power Control. This will add a Widget to your home screen to enable/disable these settings.
Note: If the device has been updated to Android 2.3.3 (Gingerbread) or higher, you can also access these settings quickly by dragging down the notification bar and selecting the Quick Settings tab.
Finally, make sure to close battery-intensive programs, such as the Camera, when you are done using them.