questionswhats a good iphone battery case?

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http://www.newegg.com/Product/Product.aspx?Item=N82E16855991098&cm_re=iphone-_-55-991-098-_-Product
i have one and it works pretty awesome. if i dont feel like having it on all the time i just slip it off and put it on when i need to charge my phone and it does so rather quickly.

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I needs me one of these things too.

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I opted for this model:

http://www.amazon.com/MiLi-Power-Pack-iPhone-3G-3GS/dp/B001ODEUIU

There were reviews that said this was better than the cheaper energizer one, and it will allow you to synch with itunes through the battery back, which the energizer one does not!