Tesla Inc (NASDAQ:TSLA) CEO Elon Musk on Friday termed the use of dry cathode 4680 cells in the company’s stainless steel Cybertruck “a major breakthrough” capable of major cost reduction to the company. What Happened: “It is a major breakthrough,” Musk wrote on X in response to Tesla enthusiast and investor Sawyer Merritt who also termed the use of dry cathode 4680 cells a “big deal.” Merritt wrote in a post that the use of dry cathode 4680 cells can help Tesla reduce costs between 15% and 30% if they can scale production and may also result in higher-density batteries. “If they can figure ou…