Full charge of iPhone XS Max off of iPad Pro 12.9
I drained my iPhone Max to the point it shut itself off, amazing how much it throttled itself after 5% battery, made sure my iPad Pro 12.9 was at 100%. Plugged the iPhone into the iPad’s USB C port and let it set. It took about 2 hours and 40 minutes and the iPad had 57% battery free. Neither device was used during that time, just me checking the battery level of the iPhone.