It has long been the common belief here on TMC that if one preheated the cabin, while on shore power, with range mode off, the battery pack would also be heated, provided the pack was cold. (if the pack had been charging, it may not have been cold.) I think there is a chance that this behavior has recently changed. I am saying that because of some posts in another thread. Here is one of the relevant posts: TeslaFi.com Basically using TeslaFi, we can see when our battery heater is on. And it appears it may not be turning on when preheating the cabin. Additionally, it seems that the battery heater may not come on 100% of the time the battery is cold and a drive is started with range mode off. The common belief here had always been that the battery heater DID come on in this situation, which was one of the reasons wh/mi numbers are quite high during short, cold drives. It would be great if others with the ability to monitor the battery heater weighed in on this. Thanks!