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Why are Teslas’ batteries dying in the cold?
https://www.theguardian.com/technolo...harging-winter

For nearly a week, frigid temperatures from Chicago to northern Texas have made life painful for electric vehicle owners, with reduced driving range and hours of waiting at charging stations.

It is well known that EVs lose some of their travel range in the cold, especially in subzero temperatures like those that hit the nation’s mid-section this week. Studies found that range loss varies from 10% to 36%. EVs also do not charge as quickly in extreme cold. Some Tesla owners near Chicago told reporters their cars would not charge at all.

Inside EV batteries, lithium ions flow through a liquid electrolyte, producing electricity. But they travel more slowly through the electrolyte when it gets cold and do not release as much energy. That cuts into the range and can deplete a battery faster.

The same happens in reverse. Since electrons move more slowly, the battery cannot accept as much electricity from a charging plug. That slows down charging. The problem is that when temperatures plunge, batteries have to be warm enough for the electrons to move. And they have to be even warmer at fast-charging stations like Tesla’s.

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