I don't have $70-$100 for a Mophie. Amazon and eBay have generic ones for $20, however, the reviews are mixed. Some say it works fine, others say theirs crapped out after a couple uses. One like this: http://www.amazon.com/Patuoxun-Exte...=UTF8&colid=32ZYR0DFLJBU&coliid=IMEQH7JL5800Q (i'm pretty sure the reviews on that particular one are fake though) Or maybe I should just get an external battery? I'd be sacrificing the convenience of having it built into a case, and the style, for one that probably works better, and is cheaper, but inconvenient having to carry a 2nd device in my pocket.