Since your phone is like a small computer, you are likely to use it more often which could drain your battery. To conserve battery life between charges, you can:
Minimize recording or watching videos, listening to music, or taking pictures.
Reduce the number of Widgets that stream information to your Home screen, like
news or weather.
Reduce the frequency of Email updates: Touch Email > More > Account
settings > Email check frequency > select Every hour or Never
to check for email manually
Manually refresh your Gmail. You can change from automatic to manual by
launching the settings menu from the Home screen, then go to Data
Synchronization > Google and de-select the box for Auto-Sync.
Turn off Bluetooth power: Touch Settings > Wireless controls > Bluetooth.
Turn off Wi-Fi if a Wi-Fi hotspot is not available: Touch Settings >
Wireless controls > Wi-Fi.
Turn off GPS
Reduce the frequency of the Google™ app updates: Touch Settings >
Data synchronization > Google > Background data
Lower the display brightness: Touch Settings > Sound & display > Brightness and
select dimmer setting.
Shorten the display timeout: Touch Settings > Sound & display > Screen
timeout and select a shorter setting.
You can also use the widgets on the Home screen to turn off Wi-Fi and Bluetooth when not in use or purchase a backup battery as well.