One question I am often asked is how to stop the iPhone's battery draining so quickly!
The official word from Apple is here and of course contains the usual advice of turning off wireless, going into airplane mode in a low-signal area, minimizing location based services, checking email less frequently, dimming the screen and turning off 3G.
When I need to preserve the battery so that I am able to make and receive calls at the very least I do all of Apple's suggestions but have noticed lately that the one precaution that really does make the most difference is lowering the screen brightness to it's darkest setting.
Adjust brightness: Dimming the screen is another way to extend battery life. Go to Settings > Brightness and drag the slider to the left to lower the default screen brightness. In addition, turning on Auto-Brightness allows the screen to adjust its brightness based on current lighting conditions. Go to Settings > Brightness and set Auto-Brightness to On.
Good Luck!
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