it's a knock off battery case.. anyone ever bought one before? decided to not buy the mophie but going this route.. do they work? mess with your iphone by any chance?
http://www.ebay.com/itm/160976250892?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
http://www.ebay.com/itm/160976250892?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649