I've basically assumed that the degradation of performance of electric batteries in things like electric cars and buses is pretty much just Arrhenius acceleration, but this article about electric buses in Scandinavia being parked because they could not run at all at -34C (about -30F) indicates that what is afoot is not just deceleration of production of electricity, but rather a phase change that makes them into extremely expensive "bricks". Oops.
And it gets that cold pretty often here in Minnesota and Wisconsin....sorry, Tesla owners, you've been had.
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