Supporting 12 volt doesn't seem to be part of the USB-C PD spec though, so before looking at this as an option for a 12 volt QMX, it would be good to check what a particular power bank supports.
?
From usb.org:
?
Fixed voltage outputs:
? 5 V, 9 V, 15 V and 20 V depending on PDP
? Optional voltages may additionally be supported
?
Something I noticed by the way, is that leaving the trigger board plugged in (but not the radio) slowly drains the power bank's battery. Not sure if that is because of the power it consumes, or because it doesn't allow the power bank to turn off. Mine seems to drop about 10% per day when I forget to unplug the trigger board.
Willem VA2WLM