Tesla CEO Elon Musk. AP Photo/Jae C. Hong 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. The battery pack is the most expensive part of an electric vehicle. Visit Business Insider’s homepage for more stories . Tesla may have a big cost advantage over rivals like General Motors and Porsche when it comes to battery packs, according to estimates from Cairn Energy Research Advisors. An electric-vehicle battery pack made with cylindrical cells, the kind Tesla uses, cost $158 per kilowatt-hour (kWh) last year, the firm said. Battery packs made with pouch cells, like those used in the Porsche Taycan and Chevrolet Bolt EV , cost $200 per kWh last year and prismatic cells, like those used by BMW , cost $253 per kWh, according to Cairn. Sam Jaffe, a managing director at Cairn, told Business Insider that companies buying or selling batteries rarely disclose prices, so the research firm estimates past and future […]

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