How much energy to preheat battery and car from 20F?

[Gasaraki]

Battery will take a very long time, it’s thermal mass is huge. Plus, if it is 20 degrees, your battery temp won’t likely get to 70 degrees unless you are driving it hard.

also... are you using some app to determine battery temp?

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[zef2021]

Can someone answer these questions:
1) If the car and battery are at 20F (-7C), how many KWh are used to bring the car and battery up to 70F (21C) ? I assume this doesn't make a difference whether driving or pre-heating.
2) How long does it take for the battery to heat up from 20F to 70F when doing preheat not plugged in?
Thank you.

I did two tests on this and shared my findings on my channel. Check these two videos: