It can be done! This is a very elegant solution to the clunky battery problem we have all faced doing POTA and SOTA. This makes powering your QRP ham radio extremely easy as well as making charging your field battery 10,000 times easier and more convenient!
Links
Charmast Power Bank
https://amzn.to/3M2BSug
PD to Barrel connector (There are a few different Barrel sizes too!)
https://amzn.to/3WIW60H