The 2000 Insight simply refuses to charge its batteries very hard when they're very cold. Regen starts to fall off when it's below freezing out, and at 10°F, I have almost none. Assist is also reduced with temperature, and at -20°F the 12V starter gets used. The Volt has lithium ion batteries instead of my NiMH, but I imagine they'll be all but useless in frigid weather.
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