[londons_explore]

Big fixed installations (think multi megawatt industrial sites) have far more batteries compared to surface area. That means it makes sense to simply wrap the batteries in insulation and use heaters to keep them warm over the winter. Sure, you use a little power to do that, but you gain back far more performance.

For $50 worth of electricity, you can keep something the size of a refrigerator 40 degrees F warmer than the outdoor air all year if you can surround it with an insulating box 2 inches thick.

In a car, the volume to surface area ratio is worse, and you can't guarantee it won't be left in the cold for months without a grid connection, so you need to ensure the chemistry can work cold.