Razer has announced a USB Type-C power bank designed to augment the portable lifespan of its Stealth ultrabook. The 12,800 mAh (46 Wh) can charge up to three USB devices with its one Type-C and two Type-A ports.
http://www.notebookcheck.net/Razer-releases-USB-Type-C-power-bank-for-charging-ultrabooks.198454.0.html