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Battery Go! (Battery Life Tool) screenshot 1
Recommended by the New York Times as a top way to keep your battery lasting longer.

Reviews - "Battery Go is a handy utility for anyone taking a trip or going mobile...As such, I recommend the tool for a good idea of how you can use your iPhone when power is at a premium." - review by John Brandon

"Will definitely be welcome to heavy iPhone users. If you've gotten battery level warnings on your iPod or iPhone before and wondered just how much usage you have left, give Battery Go! a try." - Troy Dreler of PC Magazine

"Best of all is the slider, which allows you to calculate various hypothetical scenarios. Let’s say you want to watch a video, but you don’t know if you’re phone will last...