Having had a couple of USB C devices it I should say it is nothing special as a power connector, possibly weaker than even USB micro. Good old USB mini is far better. Designed for slimline mobile ’phones, and people who struggle to put the connector in the right way around, to be chucked away or “upgraded” every couple of years.
It does support rapid charging using various proprietary protocols and chargers, which work, but I don’t think are needed here.
It serves a function as a modern data connector I suppose, but doesn’t replace a big solid standard
edit: USB A (maybe 3) port in my affections. Plenty of room for one of these on this lantern. Which, by the way, is also good as a 2+ Amp output connection for powerbank applications.
edit off:
Rant off.
I think this lantern has no need for anything more than a single LED and a generic 7135 driver, perhaps modded for e-switch, preferably with a flashable Attiny controller, maybe running Crescendo. (I think it fits on even the Attiny 13).
I have not signed the interest list because I don’t think I need this, or want the weight/robustness. I already have two Cybalite/Ring/Frendo lanterns which have given good use over several years running from x3 D cells (or Cs or AAs in carriers). Notionally 300 lumens, which is plenty.
This sort of thing: https://www.amazon.co.uk/Ring-Cyba-Lite-Vega-LED-Lantern/dp/B002FW3TF4
I even gave one an emitter swap to warm it up. They are good enough for me, despite being made of (lightweight, very durable and strong) plastic.
I can also remove the reflector/diffuser and use them as a naked light bulb. Which is how they are mostly used, hanging from a tree on a bit of string, or bouncing off the roof of the tent.
I did consider hollowing out the battery box and putting in as many 18650s in parallel as would fit, together with a charging circuit, but never got around to it.
I will buy into this at the right price, I do love chunky metal things, well designed, and this looks like one.