Both the Compact II and Compact Jr brochures in the Documents Center indicate that they have some sort of combination 12VDC/120VAC system, but neither indicated what that included, nor does either make mention of a battery.
Just as some have a fear of LP systems in a trailer, I suppose that if someone had that well documented fear of batteries, called twelvevoltophobia, (See DSM-VIII) they could have special ordered a unit without a 12 volt system.
I have also seen a reference of optional LP Mantle type lights
for the Compact trailers, so one might not need a battery.
In a 1950's, 13' (?) sticky, in which I freely gave up my RV virginity, I remember that it had a stove and a wall heater, but that we had to use our Coleman lanterns at night for illumination, as well as to draw all the mosquitos inside so they wouldn't bother the nearby tent campers ......
Someday, when I get to that great RV Park in the sky, I'll look up the Hunter sisters and ask them lots of questions... and, providing that they have WiFi there, I will send down (or up?) what I find.