I noticed somethig with my usb c to usb a cable when using my ipad charger at home: On the usb a side no choice to plug it. On the usb c if i plug it with the brand of the cable on the top the charger deliver 2W. If i plug it with the the other way, it delivers 10W... I tried it several times and now i understand why it was not charging completely over the night few times.... Now i can use my anker power bank to charge it while i'm using the laptop! Can someone test it with another usb c usb a cable!?? If this is true i think this info is valuable for all of us!