thanks all for your feedback. I tried the two kinds of UBS adapters I have at home: the Sony one (with which I used to charge the battery of the Sony MZ-RH1) and a simple wall-plug with a USB output.
Neither works. All I get is a blank screen - "USB connectioN" - and that's it. In fact after leaving it plugged in the Sony one for one hour, the reader froze and I had to hard-reset it.
I just bought a wall charger "specifically designed for sony prs 650" off eBay. When I get it I'll post the result.
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