For better battery management, the few things that I have found to be very helpful on the Galaxy are:
Screen brightness: Dim it down. 40% is sufficient for all practical purposes, unless you’re in the sun. This will greatly increase the usage on charged battery.
GPS: Don’t have GPS on all the time. I turn it on when I’m getting turn by turn directions, otherwise I keep the GPS off.
Powersaving Mode: Enable it.
Juice Defender: There is a free version available from Play Store. Install it. It basically manages and shuts down apps that drain your battery unnecessarily while not in use.