Voltaic's Spark might look like a regular tablet case, but it carries solar panels (generating 8W of power) and a universal battery pack.
The battery carries as much power as an iPad's battery and takes 8-9 hours of sunlight to fully charge. It can also charge through USB ports.
Power output comes from 2 USB ports-- a 650 mA port and a 2 Amps "high-power" port. It can charge most tablets' batteries, as well as iPhones and DSLR cameras.
Ideal for environmentally-conscious customers, the case's 600D shell consists of recycled PET and is waterproof and UV resistant.