[saltcured]

Wouldn't that also mean it has to be heated before driving, or regenerative braking is also off the table?

[Reason077]

Yes, in very cold conditions, regen braking can be reduced/restricted until the battery warms up sufficiently. The car will warn you about this, so hopefully no surprises!

[bmicraft]

That's true, regenerative braking is mostly disabled until things have warmed up.