The case features in a laptop-like Lithium-ion battery so you can charge your iPad while in use. It also has a bunch of other laptop features like USB and mini-USB ports, and Bluetooth to connect the keyboard to the tablet. The case is currently only available for the iPad 2, though it may also work for the new iPad. And it's currently only available via Japanese retail site Rakuten for 5,980 yen ($75).
[via 9 to 5 Mac]