Just to update, I think I have confirmed that the message "HEATING" with the single heat wave icon probably has nothing to do with battery heating. It looks like this is the message received when the defrost function has finished. With the battery warm from a long drive, I received the 'HEATING" message on the mobile app after leaving climate control (HI Defrost) on for an extended period while the car was parked.
Also, I was finally able to capture what I think was the motor generating heat to warm the battery. I use the 'HOLD" feature instead of creep, and while I was sitting at a red light, I noticed activity on the energy consumption meter. The car had been sitting outside and unplugged for an extended period of time. The impression I get from reading the owners manual is that we can activate battery heating when we see the blue bar icon by plugging in and turning climate control on. I am starting to wonder if above a certain temperature, while you can still get the cold battery status (blue bar), battery heating is really just a function of using the battery to power the cabin heater. The average day time temp I noticed activity on the energy consumption meter was a little colder (-8C), which also showed a much more dramatic effect on regen. Maybe active battery heating when plugged in as suggested in the owners manual occurs at temps below -8C, and it is also possible there is no specific icon for battery heating as seen with Model S and X.
Also, I was finally able to capture what I think was the motor generating heat to warm the battery. I use the 'HOLD" feature instead of creep, and while I was sitting at a red light, I noticed activity on the energy consumption meter. The car had been sitting outside and unplugged for an extended period of time. The impression I get from reading the owners manual is that we can activate battery heating when we see the blue bar icon by plugging in and turning climate control on. I am starting to wonder if above a certain temperature, while you can still get the cold battery status (blue bar), battery heating is really just a function of using the battery to power the cabin heater. The average day time temp I noticed activity on the energy consumption meter was a little colder (-8C), which also showed a much more dramatic effect on regen. Maybe active battery heating when plugged in as suggested in the owners manual occurs at temps below -8C, and it is also possible there is no specific icon for battery heating as seen with Model S and X.