Ensure to turn off WIFI and Bluetooth when not in use. Install a homescreen widget (Go widget) which can allow you to easily dim or increase screen brightness as needed.
If you’re in an area with very poor or no signal, then switch to Airplane mode to save your battery.
You can remove Airplane mode at intervals.
Set sleep time to no more than 1 minute idle Set your phone to not sync too often Re-calibrate your battery by wiping battery stats under Advanced in clockworkmod recovery