I just uninstalled/reinstalled the 737 again.
Deleated my default flight (cold/dark C172).
Loaded a new flight with the 172, shut down engines and Batt only.
Loaded the 737.
Applied EP, then started APU same procedure as I listed before.
Tried all AC/DC meter select options.
Dead battery after 5-6 minutes, no radios, no engine start possible.
Shut down APU and verified battery dead.

For now I'll just use the electrical always available entry and forget it. I'm ready to fly, lol. Maybe in time if more people see the problem they will address it.