There is one micro usb port on left side of the charger hub, i chated with one of the dji custumer service guy, he said that this micro usb port is for android phone charger or iphone charger using micro usb cabel, and also can use powerbank to charge using micro usb cabel

The manual states it's to update the firmware of the charger. Nice to see you can use a power bank though

Powebank usage is great! Do you know if it supports Quick Charge 3?

That is great,was wondering if I could do this

My 2 powerbank that i used at above picture, they did not work

Mine does not work either, it has Quick Charge 3 support.

Good to know! I posted this same topic earlier and I was not able to get the power bank to charge the hub. What output is on your power bank in the picture you posted?

Hi bcharleson...my 3 battery that charge using powerbank...it did not work...it just worked for a few second, after that...no led flash

Oh too bad! I was hoping this would worked (and with Quick Charge 3 support!)

Hi all, the micro USB port on the left sight is for firmware upgrading like CtotheE mentioned.