Mercedes-Benz Tests Solid-State Battery in EQS Prototype, Aiming for 620+ Mile Range with 25% Energy Density Increase

Mercedes-Benz is testing a solid-state battery prototype in a modified EQS sedan, targeting a range exceeding 620 miles (998 km). Developed with Factorial Energy, the lithium-metal battery features dry cathode pouch cells and a floating cell carrier with pneumatic actuators for stability. The prototype aims for a 25% range increase over lithium-ion batteries of similar size and weight. Factorial Energy supplied cells with up to 391Wh/kg energy density and over 106Ah charging capacity. Mercedes-Benz and Factorial Energy are jointly developing a next-generation solid-state battery, codenamed Solstice, targeting 450Wh/kg energy density and an 80% range increase.