Batteries are key. Demand is expected to quadruple in the next 5 years, and battery manufacturers are going to struggle to keep up. As a consequence many auto m

Batteries are key. Demand is expected to quadruple in the next 5 years, and battery manufacturers are going to struggle to keep up. As a consequence many auto manufacturers are going find their sales constrained by their battery supplies. Tesla is at present way ahead of all the other auto companies here. That's because Musk realized a decade ago how important battery production is, and so Tesla and Panasonic built a battery factory that was about 10 times larger than any existing one. But who knows what the future will bring.