I use a 12v to 120v inverter that plugs in the 12v power point (looks like cigar lighter socket) to run my netbook from when using it in my truck. The better ones often have 5v USB output but more important, they are better regulated. Even if the inverter doesn't have the 5v, you could just plug in your regular charger. A friend of mine charged her phone that way once when we were on a road trip.
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