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Consumer News: Electric vehicle batteries perform worse in cold weather, AAA study finds

PhotoAre you commuting in a Tesla during the polar vortex? Be prepared. A new study by the American Automobile Association (AAA) found that cold temperatures can temporarily reduce the range of electric car batteries by 41 percent.

To compare how the batteries performed in extreme temperatures, both hot and cold, the organization evaluated five vehicles: the 2018 BMW i3s, Chevrolet Bolts and Nissan Leafs and the 2017 Tesla Model S 75Ds  and Volkswagen e-Golfs.

In 20-degree weather, the average driving range dropped by 12 percent -- but only when the car’s heater was not used, an unlikely scenario for people driving home in freezing temperatures. When interior heaters were used, the range dropped by an average of 41 percent.

Hotter weather, by contrast, did not appear to have as dramatic of an effect. Researchers said that the battery range dropped by 17 percent with the interior air conditioners running in 95 degrees.

Cold-weather drivers urged not dwell on limitations

AAA researchers say that people who live in cold areas shouldn’t be deterred from buying an electric vehicle. They just have to be prepared.

“As long as drivers understand that there are limitations when operating electric vehicles in more extreme climates, they are less likely to be caught off guard by an unexpected drop in driving range," AAA Automotive Engineering Director Greg Brannon said in a statement.

The findings may have taken some drivers by surprise. Elon Musk has previously downplayed concerns that cold weather reduces battery power.

“So what’s the story I hear about the 45% battery power loss in cold weather conditions?” a fan tweeted at him last December. “Has to be true since most all batteries lose some power in Canadian cold weather situation.”

Musk responded that Tesla batteries only lose 10 percent of their range in cold weather, no different than what would happen in a traffic jam.

“As the battery warms up, almost all of that is recovered,” Musk claimed. “There is a roughly 10% range loss for cabin heating. Cabin heating impact on range is higher in slow traffic, but range is also higher in slow traffic.”



Posted: 2019-02-08 17:39:31

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