How to Maximize Battery Life on Your iPad, iPhone, or iPod Touch

Keep Your iDevice Out of the Sun

Don�t leave your iPhone or iPod sitting in a hot car�heat kills batteries faster than any other factor, and your device that used to keep a charge for hours will eventually barely hold a charge, and you�ll have to pay Apple to get it replaced. The same thing holds true for any really hot environment: try and store your device in a cool place.

Reduce the Screen Brightness

If you keep the screen at maximum brightness all the time, you�re wasting a lot of battery life�and the screens these days are so bright anyway that you don�t really need to, especially at night. Head into Settings -> Brightness & Wallpaper to adjust the default level of brightness, which you can probably keep as low as 30% most of the time.

Make Sure the Screen Locks Quickly

Even if you�ve adjusted the screen brightness, there�s still no substitute for having it turn off quickly when you�re not using it. Head into General -> Auto-Lock to set the screen lock to happen as quickly as your device will let you. This makes a big difference if you are always picking up your phone and putting it back into your pocket without turning the display off.

Use Airplane Mode When You Don�t Need Internet (iPad/iPhone)

If you�re busy spending the next 8 hours playing Angry Birds, there might not be a good reason to have internet access, so you can consider using Airplane Mode, which turns off both Wi-Fi and the regular wireless radio. Of course, this will prevent phone calls if you�re on an iPhone�but if you�re busy with Angry Birds you probably don�t want the interruption anyway....