Stellantis and Factorial Energy Reach Key Milestone in Solid-State Battery Development Amsterdam and Boston, MA – April 24, 2025 – Stellantis N.V. and Factorial Energy (Factorial) today announced the successful validation of Factorial's automotive-sized FEST® (Factorial Electrolyte System Technology) solid-state battery cells. This achievement marks a significant step forward on the path to bringing next-generation electric vehicle (EV) batteries to market. "Reaching this level of performance reflects the s ...