By the way: Chargers for most Nokia cellphones may work, too. They deliver 5.3 V at 500 mA, positive middle pin. So charging will be not as fast as with using a PSP charger, but as the cellphone charger is the one that you'll take with you on vacations anyway, this would eliminate the need of a second wall wart.
Only problem's the plug; does not fit the reader. But if you get hold of an adapter plug, this could be a neat universal solution.
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