10 Ways To Increase HTC Desire Battery Time
1. Disable Background Data syncing : Settings > Accounts & sync > Untick Background data
2. Disable Auto-sync : Settings > Accounts & sync > Untick Auto-sync
3. Turn Vibrate Notification off: Settings > Sound & display > Untick Phone Vibrate
4. Turn Off Haptic feedback: Settings > Sound & display > Untick Haptic feedback : Vibrate when pressing soft keys and on certain UI interactions.
5. Reduce Screen Brightness: Settings > Sound & display > Brightness > Untick Automatic brightness > Reduce Brightness by sliding to left
6. Reduce Screen Timeout Interval: Settings > Sound & display > Screen timeout (default 1 min) > Reduce to less than 1 min (15 seconds minimum)
7. Disable WiFi : Settings > Wireless & networks > Untick Wi-Fi
8. Disable Bluetooth: Settings > Wireless & networks > Untick Bluetooth
9. Disable Unnecessary Running services: Settings > Applications > Running Services > Select and Stop any apps that you are not using
10. Customise Data Options of Individual Apps : normally in Setting options of each app. Change intervals / frequency of data pulls or disable background syncing altogether. Pay attention to Twitter clients, RSS apps and mail especially.