I've searched around and I'm not sure there is any hard evidence on this. Currently I'm loving my iPad Pro, the combination of the keyboard and pencil has made this a really great experience for me so far. The only issue that I'm having is charge time, not battery life, charge time. I'm getting around 8 hours of battery which is fine with me, it lasts a full work day even while connected to the keyboard. With extensive use of ProCreate or AutoDesk Graphic the battery seems to drain a little faster. I'm sure this isn't the Pencil that's using more battery but the intesiveness of processesing those apps require. If I don't charge it overnight, there are times where it's dying at 4-5pm. It's 4.5 hours to fully charge it with the 12w adaptor that is included with the iPad. Has anyone used the 29w adaptor for the MacBook with the USB-C to Lightning adaptor. Are the results any better?