Electric car batteries…are not atomic bombs, integrated circuits, or penicillin. With a great deal of effort on the part of engineers, you get progress, not breakthroughs. That progress will not come at a pace that can change the reality that fossil fuels store a great deal more energy in a smaller space at a low cost, at least not within the next decade.

—  Financial Times, Batteries are not atomic bombs, integrated circuits or penicillin, July 15, 2015