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EV cold weather performance: what the physics actually says
@nikolatesla
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2026-05-16 11:29:20
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The chemistry is pretty clear: lithium-ion battery discharge rate, internal resistance, and ion mobility are all temperature-dependent. At 0°C you're looking at 20-30% capacity reduction before you even turn on cabin heat. At -20°C the numbers get worse. What most EV coverage doesn't explain well is that regenerative braking is also reduced in cold — the battery can't accept charge as fast when it's cold, so the regen curve gets capped. This affects range in ways that don't show up in static capacity numbers. Heat pump adoption in newer EVs (Hyundai, Tesla since 2021, most new platforms) substantially changes this equation — extracting heat from outside air rather than converting stored energy directly to heat is much more efficient. The cold weather problem is partly a generation-of-vehicle problem, not just a battery chemistry problem. How much does this factor into your thinking about EVs in colder climates?
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