They certainly have innovated, both in a battery technology and processes. For example, in Charlie Rose's interview, Elon explained that difficulty is not in a

They certainly have innovated, both in a battery technology and processes. For example, in Charlie Rose's interview, Elon explained that difficulty is not in a single battery cell tech, but how to assembly them together so that maximum efficiency is gained. http://www.charlierose.com/view/interview/10550 http://www.charlierose.com/view/interview/10550