For those of you who have been complaining that your iPad doesn’t charge via a regular USB port on your computer or laptop, here’s some clarification from my friend Greg over at GetUSB.info that it will charge if you put it in sleep mode:
The iPad will power over USB ports with “high power” while in use.
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The iPad will [obviously] charge when used with the supplied 10 watt power adapter.
The iPad will not charge over lower powered USB ports while “in use” however, they will charge when asleep.