I made no claim of the type you're implying, although I do work in the automotive industry. My comment was strictly related to history - A123 Systems was also a company of electrical and mechanical engineers attempting pretty much the same thing, and they failed nonetheless (you can look up the history if you're curious). My point was that technical expertise is insufficient on its own to guarantee success in areas like this where a minor manufacturing defect can brick cars or light them on fire months after they leave the factory. That's what extensive QA at scale means - every single battery that gets sold has to be extensively checked for performance and safety or else you get Galaxy Note 7 or A123... again.