I went down this rabbit hole when I got mine.
I found a cheap amazon 5521→usb-c adaptor and thought “cool, I can just plug this into my usb battery bank and run my lights” but that didn’t work out because the batter bank didn’t put out more than 5v.
But I have since looked into it and if you have a battery bank that supports PD power, such as one like:
Then you should be able to use the re-programmable PD compatible usb-c→5521 cable like this one:
or the fixed 12v version: