Quote:
Originally Posted by Dylrob
I can think of at least one reason: USB only supplies 5W at most. The dock connector can supply 10W, and this new Lightning connector may even supply more. This may not be such a big deal for the iPhone or iPod touch, but it is huge for the iPad. It needs a lot of power to charge in any decent amount of time. Other comparable tablets tend to use one form of proprietary connector or another for the same reason.
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You can supply more than 5W on USB. My NookColor, for instance, comes with a charger that supplies 2A (10W), as opposed to the 0.5A you get on a PC USB port.