Turn off bluetooth, gps, wifi, auto sync, and the "scanning always availible option" for your wifi when not in use.
The weird thing with wifi here is that it is almost always checking to see where you are to assist with gps functions.
If you're looking for an app, I suggest "Deep Sleep Battery Saver" which puts your device in a "sleep-like" state while the screen is off meaning that it will do what it usually does more intermittently than it usually does.
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Ok thanks, the only thing that really applies to me is auto sync since it required that to back up photos
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Don't forget, these phones have screens that are all too much for themselves. Even at their lowest brightness you'd be draining quite a bit of your battery when using it for any significant amount of time.
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Ok. I used it for a half hour straight at one point, but the rest of the day was only on and off for a minute at a time.