Join Date: Sep 2005
Location: People's Republic of Vermont
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I have heard that it's not the kind of battery people think it is that would be so affected by the cold, and in any case, that the Prius takes care of its battery's temperature automatically. I'm not sure if that's true. But here in Vermont, temperatures that cold happen as the low overnight a dozen times a year, and plenty of us have Prii that are just fine. So unless you mean that -30C is a temperature your thermometer sits at for days at a time, rather than being the overnight low, I am pretty sure you don't need to worry. And even if you do, I still doubt it.