Let me start with at this time your not going to find a quality charger with USB C for $30 or under unless heavily discounted, let alone without a display etc if you were to make compromises a quality charger could be recommended but with the requirements nothing comes to mind.
The only decent charger that I know of with USB-C (that isn’t real expensive) is the XTAR VC8, but it doesn’t meet most of your criteria. Couldn’t you just carry one extra cable or perhaps a small adapter?
Thank you for all your suggestions. Of these, the best option seems to be MC4S. This is probably the best option. I tried to find something interesting, but it’s actually very difficult with my requirements.
@MtnDon
My dad is still using a camera that is powered by two AA. I recently bought him rechargeable AA for it. So it’s not just about flashlights.
I was about to say Xtar PB2S but you need lifepo4 charging… just curious but does anyone still use small cilindrical lifepo4 batteries? I know they’re way above Li-ion for solar applications but the smaller cells were never interesting to me.
You’ll have to sniff out which of the USB chargers are USB-C though as that’s on a designation. Maybe sort by “power” and then look at the date.
I did that and first one I see is a USB-C charger I’ve never heard of, but does it have what you want? It won’t charge nihm, etc. It looks like Solar powering it is not a thing you can plug and forget about it. https://lygte-info.dk/review/Review%20Charger%20Hohm%20Tech%20School4%20UK.html