- Turn off push e-mail. No doubt about it, forcing your iPhone to check for new mail every 15 minutes–especially if you have multiple accounts–will kill your battery in a hurry. It can kill your productivity, too. Tell friends and co-workers that if they need to reach you urgently, send a text.
- Turn off location services. A lot of apps tap the phone’s GPS when they don’t really need to. Head to Settings, Location Services, and disable the feature for the apps that can live without a location check. (I’m looking at you, Angry Birds!)
- Turn off notifications. While you’re in the Settings app, tap Notifications and turn off all unnecessary sounds, alerts, and Home Screen badges. As Pogue points out, the apps that use these features have to monitor your iPhone–and that uses up juice.
- Manually terminate background apps. Apple says background apps aren’t technically “running” unless they’re front and center, meaning they shouldn’t be drawing any power. Pogue’s Genius says otherwise, and that you should manually shut down all background apps. I disagree, as I think the hassle of constantly monitoring and terminating apps isn’t worth the battery boost you might get. (Pogue cites a friend’s dramatic improvement in battery life after following all four of these tips, but I think turning off push e-mail made all the difference.)
- Lower the screen brightness. Nothing sucks up juice like the screen. If your brightness setting is cranked to maximum, knock it down to 50 percent. You won’t like this at first, but I guarantee after an hour you won’t even notice the difference. You will, however, get longer battery life.
- Keep it out of your pocket. The hotter your iPhone gets, the faster the battery will die. And you know what’s in your pocket? Body heat. If you can, let the phone ride shotgun in your purse or briefcase, or keep it clipped to your belt.
http://howto.cnet.com/8301-11310_39-20066213-285/six-ways-to-improve-iphone-battery-life/
This applies to mobile phone batteries as well.
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