Its not the setting. It charges fine to 100% with the same wall-wart and a tiny usb-a to usb-c adapter then the apple cable. But not happy with my regular usb-a to usb-c cable (that works fine with everything else). Or any of the other cables in my house. A message pops up about non-compatible cable. I suspect the ipad has been designed to be deliberately fussy. I'm in europe, if that makes any difference.