Many people know that Yoobao is the maker of the best selling leather case for iPad 2 (link), but actually they are best known in China for their batteries. Yoobao is among the top 3 battery manufacturers in China for over 10 years.
Yoobao Long March Dual USB Output 11200mAh Universal External Battery Pack Power Bank and Charger is the biggest external battery/power bank/charger in their arsenal. Dan Cohen of Gear Diary noted:
Huge capacity; As close to universal as you will find; Solid; Nice white color; Flashlight; Will charge the power-hungry iPad
The full review can be found here: http://www.geardiary.com/2011/11/19/yoobao-power-bank-11200-mah-battery-review/
You can find this product on Xengadget.com: http://www.xengadget.com/products/212-yoobao-dual-usb-long-march-11200mah-external-battery-pack-power-bank-and-charger.aspx