My modern Apple LiOn batteries only last 2-3 years. They used to last longer. I wonder if being cooled to -20F shortens their lifespan. Leaving them in the car in a MN winter will do that.
Which makes me wonder about Apple’s crummy new butterfly keyboards. Could they be cold intolerant? Something to do with condensation and moisture freezing? Might explain why Apple devs might not notice a big problem. (I also wonder if they do badly with second hand smoke.)