Yes, 2 x 12V deep cycle. Batteries in recent FWCs in floor level interior cabinet, proximate to heater, i.e., pretty much interior, and easily warmed up a bit more by cracking cabinet door open.
More than somewhat. More like 2X or 3X less current draw.
PNW. We have had nights in the interior down to -12F, slept fine in winter bags.
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