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If the battery is totally dead (0%) it may be impossible to charge via USB. The 500ma intensity being too low. Normally the battery circuitry would prevent the battery to reach such a low discharge state, but who knows.
Charging with a 1A or 2A USB charger will not works, as the PRS-505 is hard wired to only charge from a real computer USB port.
You should try to charge it with the AC charger. A PSP charger works fine and is more easy to found, at worse they cost about 5USD shipped on eBay.
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