Thank you
This dual trick of of the long-press power-button reset then applying USB power fixed my problem.
The battery still had a minimal charge but plugging in any USB cord got a single short red blink then nothing.
Due to my rough physical usage (attached to child’s Tonka truck then towed through inaccessible areas and crazier things) there was an obvious concern that I had bad contacts inside.
I shimmed the battery enclosure area and cleaned up but it still refused to charge. Oh, I also verified that the battery still has lots of operational life left. And this is in January 2021.