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What is "fast-charging feature on 12.9" iPad Pro"?

I have a 12.9" iPad Pro. I bought the 29W power adapter which provides both 14.5V@2A and 5.2V@2.4A.


However, it appears to charge the iPad Pro only @ 4.95V/1.98A (using a USB-C test meter) which is the same rate that the 12W charger outputs. [NOTE: the 29W adapter does provide 14.5V@1.95A when connected to my 15" MacBook]


Just what is the much-touted but unexplained "fast-charging feature on the 12.9-inch iPad Pro"?

iPad Pro, iOS 9.3.2

Posted on Apr 5, 2017 11:01 PM

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Posted on Jun 20, 2017 11:34 AM

Did you use genuine Apple 29W USB-C charger and genuine Apple USB-C to Lightning cable? This would be critical as 3rd party cables may not work. Both Lightning and USB-C have chips embedded in the cable ends to establish the serial connection. These chips negotiate things like speed and power.


USB 3.0 comes in numerous flavors

  • USB 3.1 @ 5Gb/s Gen 1 (this is relabeled USB 3.0)
  • USB 3.1 @ 5Gb/s Gen 1 with PD (Power Delivery)
  • USB 3.1 @ 10Gb/s Gen 2
  • USB 3.1 @ 10Gb/s Gen 2 with PD (Power Delivery)


Apple doesn't specifically state which version of USB 3 they subscribe to, but you can bet it incorporates Power Delivery and supports various volt/amps. It's a gamble with third party cables. Also, be away, many "Apple" products (cables and adapters) sold on Amazon and eBay are not actual Apple products, but 3rd party products.


MichelPM's articles make it clear you can quick charge the iPad Pro.

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What is "fast-charging feature on 12.9" iPad Pro"?

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