The Leaf's battery is warmed when charging, and apparently it is well enough insulated to keep most of it's capacity for up to 3 days in sub zero temperatures.
BTW, the DOD allowed on the Leaf is 95% = 22.8kWh. They must have a very stable and robust chemistry and construction. This is at least 2.5X more usable capacity than the Volt; while the total capacity difference is 1.5X.
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