I found this
HOW TO maximize your battery life on an Ipad, Ipod or Iphone and thought this is the perfect place!
- Keep Your iDevice Out of the Sun
- Reduce the Screen Brightness
- Make Sure the Screen Locks Quickly
- Use Airplane Mode When You Don’t Need Internet (iPad/iPhone)
- Use Wi-Fi Instead of 3G if Possible
- Reduce or Eliminate Mail & Calendar Checking
- Reduce or Eliminate Push Notifications
- Reduce or Eliminate System Sounds
- Disable Location Services
- Disable Bluetooth If You Don’t Need It
- Disable Vibrate Feature in Games
- Charge and Discharge Your Battery Regularly
Some of these are common sense and you may already know this information. This is for those who don't!
Doing all of these will take the fun out of the phone imo. I would just disable the ones stated that you aren't using at all. To find more details click the link
here.