You can use a portable backup battery to charge you mobile devices, but if you need a more convenient way to charge your iPad 2, the following ccPad iPad 2 case with backup battery may be more suitable for you.
The ccPad is a practical battery case that measures 10.3 x 7.7 x 0.8 inches, and designed for iPad 2. As we can see from the images, the iPad 2 case features form-fitting design, and comes with a built-in 9000mAh rechargeable backup battery so in addition to protecting your iPad 2 from bumps and scratches, the iPad 2 case can also offer you a longer battery life, and the integrated LED indicator shows you the status of the backup battery. Apart from that, the integrated iPad stand supports both portrait and landscape viewing modes.
The ccPad iPad 2 case with backup battery is priced at $99.99 USD. If you’re interested, jump to ThinkGeek for more details. Additionally, if you need other options, you might like to check Crux Loaded iPad 2 case and NoteBookCase iPad 2 case.