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I've had a 505 since the early days, and didn't like having to buy the Sony A/C (Mains) adapter at the retail price they were selling it for back then (my out-the-store cost topped $300 for the reader and cover and adapter!). The reason I bought the adapter was because of a thread here on Mobileread back then, where the conclusion was that you effectively had to use the barrel plug charger. Trying anything via USB was futile, according to those owners. (Though maybe some charged successfully when left on USB for an inordinately long time? I forget.)
I've never tried charging via USB, just trusted those posters' experiences. I'd be interested to hear of any USB charging successes.
I've occasionally seen threads over the years on this topic, and the PSP charger always solved the 505 owner's charging problems. AnotherCat's logic is most probably correct in saying "it may be that all 505s have a particular design problem of their own". That's my guess.
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