Ok, perhaps a really silly question then...to preheat the battery, my best option is to "pre warm" the cabin climate for 20 or 30 minutes? I prewarmed the cabin this morning in my heated garage (40 degrees for about 30 min) then drove to the airport for 25-30 minutes in 20 degrees and I still had a half or quarter yellow lines for regeneration. Normal???
I've only noticed this "battery heating" logo once when I did a "cabin climate preheat" and that was when it had been sitting outside at the airport.
Yes, preheating can make a difference. Watch Bjorn Nyland's (TeslaBjorn) YouTube videos to see techniques and their impact. He lives in Norway and deals with a lot of cold weather. He also sometimes sleeps overnight in the car in Norwegian winters.