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Originally Posted by HarryT
Perhaps you misunderstood some of the previous posts.
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Nothing out of the ordinary for me there!
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You can indeed use a USB wall charger, but you need a "PSP charger cable" for that charger. You can get cables which have a USB connector on one end (which plugs into the wall charger), and a PSP charger plug on the other end (which plugs into the Reader).
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Yes I saw them too, some that even had both round plug and USB mini attached to the same down-line, and a retractor on the main line! But the wall mounted AC block was larger and heavier than a USB only device. The AC charger that I bought has only the round plug on the down-line. It's light, but still heavier than I'd like. When I travel, I cut the handles off my toothbrush and throw out the Joker from my deck of cards... Some of the island hoppers that I take in Indonesia and the Philippines only allow me 12 kilo for my baggage. Somehow this has to cover underwater camera gear, dive kit, et. all. Obviously it can't and I have to ship things by boat before I go, but I still try to cut as much weight as realistically possible.
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I'm afraid, though, that plugging a wall charger into the USB connector of the 505 will categorically not work.
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Give me another three days (there is one more charger the shop had that I didn't buy, and I want to try that one too,) and I'll either agree with you completely, or tell you the model number of one that worked!

Either way, "I" will have A) satisfied my curiosity, and B) had some fun learning new things!

(not to mention then having one of the neighborhood's largest collection of un-needed chargers.

)
I still would like to know
'why' the device can be charged through the USB from a computer but not the USB from a wall charger. The answer "because it can't" is not what I'm looking for. Perhaps we have some electrical engineering folks reading in who can tell me. As I said before, I think it's fun learning new things.
Stitchawl