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If by AC/USB you mean a charger that uses a USB plug to your eReader then it doesn't work properly... it may appear to but actually is discharging the eReader power... to charge by the USB port, the reader requires an active and awake computer to be the point of attachment. Wall charger must use the power socket on the reader... standard miniature Philips connector (barrel shape, usually yellow tip) giving 5-5.2V at around 2A.
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