USB-A to USB-C vs USB-C to USB-C

scotsmandc

macrumors regular
Original poster
Sep 26, 2015
218
125
The new ipad pro's come with a USB-C to USB-C cable and charger. Is it slower to charge using USB-A to USB-C provided i have a fast charging wall charger?
 

timlocke

macrumors newbie
Feb 19, 2019
5
0
I believe that a old iPad charger will work if you have a USB A to USB C cable. It does for me. A better answer would be Apples. 30 watt charger which is a USB C charger. I have read that the iPad negotiates it charging with the various Apple chargers but I don’t know for sure.
 

finsfanscott

macrumors newbie
May 20, 2013
22
2
Miami
My understanding is the max you will get out of the USB-A to USB-C solution is 12 watts, specifically 2.4 Amps x 5 Volts = 12 watts. This would require one of Apple’s previous iPad chargers (some were 10 watts, some were 12, will have to read the charger to see).

The USB-C charger that comes with the new 11” pro appears to be an 18 watt charger, as I got 9 Volts at 1.9 Amps when I measured it, charging with Apple’s USB-C cable.

The USB-C charger that came with my 2016 Macbook is a 30 watt charger, because I get about 15 Volts at just under 2 Amps, again using Apple’s USB-C cable.

The higher the wattage, the faster the device will charge. Based on reading other comments, I believe the 30 watts is the most the 11” iPad Pro will draw, even if you use a higher wattage charger, but I can not verify that for myself as I don’t have a higher wattage Apple USB-C charger.

Hope this helps!
 

timlocke

macrumors newbie
Feb 19, 2019
5
0
The Apple store man said the 30watt charger USB-C to USB-C was the most a new Ipad could make use of...so that is what I have and it does charge fast.