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A Tesla Motors Inc. Model S electric automobile sits connected to a charger inside a Tesla store in Munich, Germany, on Monday, March 30, 2015. Chief Executive Officer Elon Musk wants to transform Tesla into more of a mass-market automaker by building a battery-cell factory big enough to supply 500,000 vehicles by 2020. Photographer: Krisztian Bocsi/Bloomberg via Getty Images

A Tesla Motors Inc. Model S electric automobile sits connected to a charger inside a Tesla store in Munich, Germany, on Monday, March 30, 2015. Chief Executive Officer Elon Musk wants to transform Tesla into more of a mass-market automaker by building a battery-cell factory big enough to supply 500,000 vehicles by 2020. Photographer: Krisztian Bocsi/Bloomberg via Getty Images