Backup batteries needn’t be large, strangely_shaped, and clunkier than the devices you’ll need to charge, as most are. Take Vorson’s Bookmark, the world’s thinnest mobile backup battery. Measuring in at a paltry 4.7mm, the Bookmark is actually thinner than all your portable devices, including your brand new smartphone and air-y tablet. We forgive Vorson for […](Visited 4 times, 4 visits today)