Tesla may have a big advantage over Porsche and GM in the most expensive part of an electric car

Tesla may be paying less for battery packs than rivals like General Motors and Porsche, according to Cairn Energy Research Advisors. Last year, an electric-vehicle battery pack made with the kinds of cells Tesla uses cost around 25%-60% less than packs with cells used by companies like Porsche, General Motors, and BMW, Cairn estimated. More »