Can you remember the last time you didn't have to charge your battery twice in a day? Your smartphone's battery rarely lasts a full day, and carrying external backup is a burden. Unless that's a Vorson's Bookmark backup battery.

It packs 2500 mAh, and is just 4.7 millimeters thick. The $60 Bookmark even offers enough current to charge larger devices like the iPad Air. [Vorson]