Double the life ??
First off I was very happy with the company I bought this from. My issue is with the overall function of the product. At best it adds maybe 3 hours of extra time, also the mini USB adapter needs to be pressed in and watched because it looses its connection and needs to be pressed back in. Many times I have plugged it in at night to find it only semi charged the next morning. The other issue is that it does not always sync to my car to use my itunes. Overall an average product at best.
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