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TURN YOUR iPAD INTO a "MACBOOK AIR" With the “NoteBook Case” for iPad. The case packs a built-in Lithium-polymer battery, a USB port, and Bluetooth for the keyboard. (around $85)

Aqua Tek S - The powerful iPhone case... Very tough polycarbonate case with a built-in Lithium battery and a solar cell... (useful if you are in the middle of nowhere).