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How to extend the battery life of your iDevice
1. Keep it Out of the Light
Using your iDevice in direct sunlight for an extended period of time will hurt your battery, and make it harder to hold a charge (not to mention the overheating issues). Keep it at about the same range of temperature as your own body and you will be fine.
2. Turn Down the Brightness
By turning down the brightness on your screen, you will reduce the amount of battery that is used to keep it lit. You do not have to make it so dim that you have trouble seeing, but choosing the lowest setting that's still comfortable for you will help. In iOS5, Brightness can be found directly under the Settings app.
3. Use Wi-Fi Instead of 3G When You Can
Using Wi-Fi instead of 3G will enhance your battery life by about an hour, according to Apple. So, when you have the choice, take the time to connect to the Wi-Fi network for your browsing. The additional bonuses here, of course, are that it's faster and that you'll save your data download limits when you need it.
4. Keep Push Notifications to A Minimum
Every time you receive a push from an app, you are forcing what may be a sleeping phone to wake up, and that uses up your battery life. Since the odds are that your friends' Facebook statuses are not that critical, save the push only for the most important of information.
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