A Crazy Thin Backup Battery You Can Probably Also Use as a Bookmark

You know the drill. Your smartphone's battery rarely lasts a full day, but carrying around a clunky external backup sounds like a hassle coupled with a burden. Unless you've opted for Vorson's Bookmark which packs a 2,500 mAh battery into a remarkably thin housing that's just 4.7 millimeters thick. There are magazines… » 12/13/13 10:00pm 12/13/13 10:00pm