Volkswagen is doubling down on electric vehicles with the opening of a cutting-edge battery testing facility in Tennessee.

When electrical engineer Charles Abend opens the giant double doors to the temperature chamber, a new Volkswagen ID.4 emerges from a plume of ice-cold smoke. Tiny particles of snowy condensation flutter in the air above the car, just below the lights mounted in the chamber’s ceiling. As Abend describes it, temperatures inside this reinforced chamber can drop to...

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