USBatteries
This is so simple. Continuance is a set of batteries with a USB interface on the side. The batteries are rechargeable plus dole out some juice to stranded gadgets that are starved of power. Handy, compact and a totally do-able concept! Kudos!

Continuance is an iF concept design entry for 2011
Designers: Haimo Bao, Hailong Piao, Yuancheng Liu & Xiameng Hu