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That's not that simple at all...
If you google for USB & charger & problem you will recognize that here are a lot of peoble out there having similiar problems with loading various gadgets over USB.
Reason could be that USB ports and chargers differ from each other concerning power. And more than that, different gadgets (readers, cellphones, ...) differ in handling switching to charging mode.
USB ports have 4 wires inside, two of them are for power supply (which differs in voltage/ampere).
Some device just need the two power connectors to be loaded (and of course enough power).
Other devices are checking if on the other side of the cable is a PC, a charger, if there is enought power, or (I guess) the "original" Apple-charger.
And exactly here lies the problem. To charge some devices switch into charging mode. And before doing that, they have to recognize a chaerger as a charger. Which doesn't always work.
You can find various work arounds to solve this problems. For example soldering an electric resitance between two of the four wires. Or bridge two distinct wires... or...
I guess, the Sony-readers are checking "whatever ist is" exists otherwise refuse charging.
A.
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