Stellantis Starts Road-Testing Solid-State BatteriesStellantis (Stellantis)Stellantis has fitted a Dodge Charger Daytona with a prototype solid-state battery from supplier Factorial.The Charger Daytona prototype kicks off a road-testing program, moving the potentially game-changing technology one step closer to appearing in production cars.Stellantis and Factorial say the battery has an energy density of 375 watt-hours per kilogram and can recharge from 15 to 90 percent in just 18 minutes.For years, we've been hearing about the game-changing potential for solid-state batteries, which promise higher energy density and faster recharging rates. While there has been plenty of hype around these more advanced batteries, we've still not seen them in production-spec cars in the U.S.Now, however, solid-state batteries just got one step closer, with Stellantis announcing that it has fitted a Dodge Charger Daytona test vehicle with a solid-state pack from Factorial to begin real-world testing.AdvertisementAdvertisementStellantis and Factorial first announced their intentions for a test fleet of solid-state-equipped Charger Daytonas last fall, saying the program would begin in 2026, and now the automaker has confirmed that the road-testing program has begun. This wasn't a huge surprise, as we recently spotted a Charger Daytona emblazoned with a similar livery to the one seen above when we attended Stellantis Investor Day last month at the company's headquarters in Auburn Hills, Michigan.Stellantis (Stellantis)The Charger Daytona prototype features Factorial's FEST (Factorial Electrolyte System Technology) battery, the first time solid-state cells have been integrated into a Stellantis vehicle. In 2025, the two companies demonstrated a claimed energy density of 375 watt-hours per kilogram, the ability to recharge from 15 to 90 percent in just 18 minutes, and reliability at temperatures ranging from -22 degrees F to 113 degrees F.Stellantis says the solid-state FEST cells were integrated into the existing battery pack using a new mechanical architecture, with the company also reworking the control systems and pack design for better performance without sacrificing safety or durability. Stellantis didn't say how long the testing program will run for or when to expect to see Factorial solid-state batteries in production vehicles, although several companies have promised them by 2030. While we will still have to wait for this advanced new technology for a bit longer, the start of Stellantis's test program is an encouraging sign.➡️ Skip the lot. Let Car and Driver help you find your next car.Shop New Cars Shop Used CarsYou Might Also LikeGift Guide: Best Ride-On Electric Cars for KidsFuture Cars Worth Waiting For: 2025–2029