I've spent some time today looking for a charger for my 505. I did consider the PSP charger, but found one on ebay for the Sony 505
http://cgi.ebay.com/ac-wall-charger-...:B:SRCH:US:101
it's only a 5.0v but from what I've read, I think it will be ok. I was pretty happy with the price of $7.35 out the door.