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Other USB chargers will work, BUT you won't receive notification that it is charging, and it charges much slower (about 75% slower at 500 mAmps instead of 2000 mAmps); and if you are actually USING the NC while trying to charge off a USB you will still have a slow discharge.
The B&N charger has extra pins as compared to a normal USB, and provides extra power to charge faster over those extra pins.
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