Prop icing
As an interesting aside (well, to me, anyway)...
We ran up the fleet of PA28s yesterday as they hadn't run for a few days and would be likely laid up for another few. I ran one at 1500-1800 RPM slightly leaned off until the oil temperature was just into the green arc. The weather conditions were 125m in fog, -2/-2. When I'd finished, I had a look at the prop; there was a THICK layer of ice on the leading edge and all down the back of it, both blades, on the inboard half. That was just from running it on the ground in the fog! Of course, there's absolutely NO anti/de-ice capability on the Warrior, aside the Pitot heater.
Hopefully the benefits of keeping the battery charged and thoroughly warming up the oil will offset any additional condensation that might happen inside the crankcase as it cools down again!
TheOddOne