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Some USB chargers are wired correctly, I read about a charger from a Creative mp3 player that will charge the reader, but most won't. I don't know why your charger only charges a bit.
Also if you hook up your reader to a computer to charge be sure it doesn't go into sleep mode or is switched off, this drains the reader. It might be that the charger you're using detects it as a computer in sleep mode and thus not charges (much). Who knows.
I myself use a USB wallcharger (5V 1amp) where I have to use your own USB cable, I got a USB cable which has both a PSP plug and a USB mini plug. With it I can charge my Reader (with the PSP plug) and other devices.
You could, of course, also buy the official Sony charger but it's overpriced and does the same thing as a PSP charger.
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