[Astro]

Originally Posted by NeilBlanchard

Our Leaf S has a battery heater, too. Which has to run both when driving the car - and even more so when the battery is being charged.

That is included in my energy log. 2015 Nissan Leaf S Gas Mileage (Forest) - EcoModder.com

A quick Google search found this paper which has several charts relating to temperature affects on the discharge capacity of LiFePo4 cells. http://ecst.ecsdl.org/content/3/36/3.full.pdf
Discharging at a high rate (eg. EVs) and low temperatures significantly decreases the amount of energy the cell will deliver. Even at room temperature the cells capacity takes a big hit compared to a cell discharging at 60 degrees C.
I wonder how much energy is used to heat the cells versus the increased capacity this gives. If the manufacturer is adding the cell heaters then total energy delivered must be higher.