I don't think it is too big a digression to explore power sources available at the field. I had assumed very few had access to 120VAC at the field but it sounds like the norm in some parts of the country.
For some of us a lead-acid battery is the only option at the field. Others either have 120VAC, solar DC, or run generators. Each one needing a different means to power the PL8, which is a problem to be addressed before balance tap adapters, parallel charging and other such details.