i.Sound offers the Portable Power Max (model DGIPAD-4544) backup battery with 16,000mAh capacity. The compact portable battery offers five USB ports for charging USB-powered devices, including smartphones, PMPs, GPS devices, as well as iPhone/iPad/iPod.
The Portable Power Max has LED indicator for charging status and comes with built-in flashlight. A USB to mini/micro USB cable is included. The price is $129.99.