Any PSP charger *will* charge any Reader under any conditions (including fully-drained battery.) A PSP charger is *not* a USB charger, and has no USB connector. Does that help?
I was hoping to charge my Reader using my available BB charger at my desk in the office. Clearly, that won't work. I don't know why Sony made the Reader so finicky wrt USB charging. I don't think it is a voltage issue either, as any USB power line will be 5V, and a straight wall-wort charger should have enough current.
The best item to have is the PSP charging cable (mentioned above) that has a regular USB connector on one end, and both mini-USB and PSP connectors on the other. That will work with any USB power source.
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