USB Rechargeable Batteries from continuance

http://www.pieway.com/technology/continuance-usb-rechargeable-batteries/

The Continuance is a set of batteries with a USB interface on the side. Designed by Haimo Bao, Hailong Piao, Yuancheng, the battery can be recharged via a USB connection. The Continuance will seek out an empty USB port, since it has a USB interface on the side that allows you to connect it to a USB cable and power the insides directly whenever it runs low on juice. Handy, compact and a totally do-able concept.