On my refurb unit, the charging seems to work OK only when the reader is totally switched off, not in standby mode. That means pushing the power switch to the OFF position and holding it until the screen displays a dialog box confirming power-off.
I found out only because I had the same charging issue, and the red-light would not come on when I just plugged in the charger (whether USB or pin-plug). When totally off, charging light comes on when plugged.
I did declare that mine is a refurb, so I always thought that it might be just one of the trade-offs...
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