The specs you quote are for the charger that plugs into the charger socket, not a USB charger. It's a part of the USB spec that a device is only allowed to draw 500mA at 5V.
If you want a "charger socket" charger (which will charge a lot faster than USB), go to any game store and buy a PlayStation Portable (PSP) charger; it uses the same charger as the Reader.
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