When I was doing car development in the Arctic, we found that just putting a battery blanket around a battery helped a lot, even if it wasn't plugged in. We also found that plugging in a battery blanket for even an hour or two before the first start of the day was more than enough most of the time. With the blanket in place, the re-charging during the drive seemed to keep the battery warm enough, so it would take a re-charge. The built up heat seemed to carry over for the subsequent starts of the day, even after extended shut downs. We had battery minders and such, but found the electric blankets for an hour or two worked the best. Some folks talk about bringing a battery into the room at night and using a trickle charger. Taking a battery out and putting it back in with stiff wires at -40 and below is not a trivial activity, even with a welding plug connection.
We made sure we always had fresh gas, and ran "Regular" when an engine permitted it, not "Premium". Regular has a lower Octane, which means it ignites easier.
On really, really cold nights, we would also put an old style, 25W trouble shooting light under the hood for a couple of hours before starting. The engines had block heaters, but found that the battery blankets and the light shining on the belts was enough in all but the really extreme conditions. (The belts at start up were the biggest concern when temps approached the -50's.)
As far as a Skandic in Very cold weather, no real experience.
Good luck, looking forward to read what others have to say.
_Jack