PADACS had churned-out UltraCharger for the iPad. The charger sports 12,000mAh lithium polymer portable battery and can charge two devices together. The charger features an on/off switch, as well as four light indicators designed to show how much power is left in the UltraCharge.
The charger provides two high power USB ports, and also comes with a USB cable compatible with the iPad. The UltraCharge package contains the main battery unit, power adapter, multifunction USB cable with 4 adapters, including USB-to-iPad, additional power adapters, and a travel pouch. Costs 99.95 dollars. [link]