Neil Hughes, writing for Apple Insider:
Buried within the hardware regulatory information for the iPad Pro, it’s revealed that the 12.9-inch tablet can use 14.5 volts at 2 amps, which is equivalent to 29 watts. However, the iPad Pro only ships with a 12-watt power adapter.
Apple already ships a 29-watt power adapter with its 12-inch MacBook with Retina display, but the thin-and-light notebook charges over a more capable USB 3 cable with a USB-C port.
The Lightning cable that ships with the iPad Pro, however, is limited to a load of 12 watts, and it features a full-size USB Type-A 2.0 port on the opposite end, not a USB-C connector.
Currently, there is no way to directly charge an iPad Pro with Apple’s 29-watt MacBook power adapter. That’s because there aren’t yet any sanctioned USB 3 Lightning cables available on the market.
Interesting.
The iPad Pro uses battery at about the same rate as an iPad Air, but charges much more slowly. Presumably the 12W limit is the reason behind this. I hope they can release a cable and charger for the Pro that would allow 29W charging. And the sooner the better 🙂