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What are some strategies to improve on the iPhone 3G/3GS battery life?

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Brightness to lowest setting, turn off 3g, wifi and bluetooth, fetch your mail manually, no autochecks.

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Doesn't get any better than that. If you follow all these suggestions, your battery life should last for days. – Russ Warren Jul 15 '09 at 15:17
I guess limiting the amount of emails you are fetching and/or pushed from would help. – Brian Jul 21 '09 at 14:19
Yes, but then we're kind of in the nitpicking area. Also, fetching mail manually, no pushing. – Stefan Thyberg Jul 21 '09 at 14:27
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I've found that GPS will drain power faster than any other feature on the iPhone, so use it sparingly at best and make sure you exit the application before you sleep the device. WiFi is also quite power hungry so if you aren't using it, turn WiFi off.

One thing that Blackberry has that iPhone does not is a magnetic sensor on the side to detect when a device is holstered, which automatically turns off the screen and slow clocks the device. iPhone requires you to sleep the device using the button the top, hence make sure you tap it before you put the device away.

There's a feature for dynamic brightness, and I would keep it on so that the screen will ramp the backlight intensity to an appropriate level depending on your lighting conditions. Lower the baseline brightness to a level you're comfortable using.

Other than that, there's not too much you can do unless you want to significantly change your usage patterns or do something incredibly inconvenient like turning off the radio entirely.

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