ohh, i see, you misunderstood me, sorry, maybe i was confusing, english is not my first language. no, i don't want to use the usb-c port on the air at all. what i want to do is this:
1: take a powerbank with a usb-c outlet port
2: stick this into it:
5V DC 5.5 * 2.1 mm Power Jack USB 3.1 Type...