nradov parent
Back when Samsung phones had user replaceable batteries they also sold separate battery chargers. This was super convenient because I could just grab a fresh battery from the charger on my way out the door. No need to carry a separate USB power bank. And moisture wasn't a problem, they had water resistant models. It's really a shame that phones have gone backwards in that area while advancing in most others.
Samsung still makes the x-cover series of phones. They're usually used in commercial applications, but, you can find them sold unlocked pretty easily.
And they offer a little charging dock with pogo pins, so, no wearing out the USBC port.