Away from the grid charging
I have a charger that will emergency charge a LOT of different things. It uses two AA batteries. You can get different tips for it to interface to the connector on most any device. I bought a micro-USB adapter and have successfully charged my nook. Getting the nook almost to fully charge from close to empty wiped out the 2 AA's. Several mfg's make these things. Mine is "Igo" brand from RadioShack. I think the gadget was ~ $20 a few years ago. Each tip is ~$15. Buy extra AA's.
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