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My favorite iPhone battery app is called Battery LED. It is available in both free and pro (99 cents) versions, with the only real difference being that the Pro version doesn’t have small banner ads running across the bottom of the screen. This app has a very colorful interface that will not only show you how much total battery power you have left, but will also show how much power you have to do individual tasks like gaming, browsing the internet, and so on. I have read some reviews where people with third generation iPods said the battery readings were inaccurate, but I can’t verify that. This battery app works with iPad, too!