When you plug your 500 into the USB port, the red light has to come on and the screen change to show it's plugged inot the USB port to know the battery is getting power.
Also, there is a hack for the 500 to allow you to properly turn off the 500 so it doesn't drain the battery if you know you won't be using it for a few days or longer. I suggest installing that and turning it off if you won't be reading.
As for the PSP AC adapter, you want one with the barrel plug on it and not a USB plug.
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