this post was submitted on 04 Jul 2023
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Technology
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In general Li ion batteries lose about 40% charge efficiency in normal cold weather. It's up to the car's systems to keep the batteries heated to reduce that, at the cost of constant power draw. In our experience with similar weather it's not far off, and for safety reasons we just assume half the battery is lost during winter driving. Mountains add into that, but aren't ultimately super extreme.