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You could just get a DC powered USB hub, cut the hubs power cable after the adapter box, then connect those two wires to a 12V sealed lead acid battery. You can find such batteries for about $30 or $40, and they'd have enough power to charge the kindle many times over. Plus they don't lose their charge over time (you'd only have to charge it a few times a year if you're not using it, just to keep it fresh.) Basically, instead of the USB hub being connected to the AC adapter (which is converting the AC power to 12v DC), you're skipping the adapter and plugging it right into a 12v battery. You just have to make sure the voltage of the hub matches the voltage of the battery. For example, if your hub has a 5V adapter, you would obviously use a 5v battery instead.
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