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Here is my review of the CasePower Charging case for the iPhone 4 and iPhone 4S.
Buy the CasePower A4i:
Amazon - http://amzn.to/Jos4p2
Website - http://bit.ly/JCeyAA
CasePower makes rechargeable cases for iPhone 4 and iPhone 4S and the iPad 2. These will double your battery life and keep your devices going strong at heavy use events like CES.