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I agree. I don't know why, but charging with the PSP round connector works better. When I charge my 500 using the USB all day it says 4 blocks. The next afternoon it says 3 blocks, even if I read nothing. Charge with the $5 PSP adapter it says 4 blocks, and still says 4 blocks a week later. The USB voltage might not be quite enough to get a really good charge.
Sure, 3 blocks is hours of reading, and I charge with my laptop to avoid taking another wall wart in my briefcase. If you have the option, go with the PSP round charger.
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