In a very nice and tidy Help Page , Google has gathered everything you ever wanted to know, about the changes you will face in coming to Android 2.3 Gingerbread Android 4.x ICS. Within this there are some specific tips for saving battery which is somewhat general in my opinion. Let's see what proposed by Google:
Extend the life of your battery
If you aren't using Wi-Fi, Bluetooth, or GPS, use the Settings app to turn them off. The GPS setting is located in Settings> Personal> Location services.
Don't leave the Maps or Navigation apps open on the screen when you're not using them. They use GPS (and thus more power) only when they're running.
Turn down screen brightness and set a shorter Sleep timeout: Settings> Device> Display.
If you don't need it, turn off automatic syncing for all apps: Settings> Personal> Accounts & sync. Note that this means you need to sync manually to collect messages, email, and other recent information, and won't receive notifications when updates occur.
If you know you won't be near a mobile or Wi-Fi network for a while, switch to Airplane mode:
Press and hold the power switch until the Phone options dialog appears. Then touch Airplane Mode.
Extending battery life:
If you use network services such as Wi-Fi, Bluetooth, or GPS, then close them. (Please fill and Data).
Do not leave open the main screen applications Maps or Navigation and using repeatedly the GPS (Here to fill that hold the screen and permanently open and illuminated).
Lower the screen brightness and the time it takes to shut itself (screen timeout)
Turn off automatic synchronization as it strives to bring new data for your applications.
If you're not near a Wi-Fi switch on flight mode (and how to get the phone, I say ;;;).
What you see is the very basics of saving, so basically not even include all the settings your device