Stellantis (NYSE:STLA) and Factorial Inc. (NASDAQ:FAC) have reached a significant milestone in electric vehicle development by integrating Factorial’s solid-state battery technology into a Dodge Charger Daytona test vehicle and launching on-road trials to assess performance, durability and safety in real-world environments.
According to the companies, the project marks the first automotive deployment of solid-state battery technology in a North American test vehicle.
First North American Vehicle Application
The demonstration vehicle incorporates a battery pack featuring solid-state cells supplied by Factorial and housed within a mechanical architecture developed by Stellantis specifically for the technology.
The integration is intended to evaluate how the batteries perform under everyday driving conditions while validating system reliability, charging characteristics and long-term durability.
The road-testing programme will provide engineers with critical data as both companies move closer to potential commercial deployment.
High Energy Density and Fast Charging Capability
The latest testing builds on progress announced in 2025, when Stellantis and Factorial successfully demonstrated FEST solid-state battery cells featuring an energy density of 375 Wh/kg.
The cells were also capable of charging from 15% to 90% in just 18 minutes, while maintaining reliable operation across temperatures ranging from -30°C to 45°C.
These characteristics are viewed as key advantages of solid-state battery technology, which promises higher energy density, improved safety and faster charging compared with conventional lithium-ion batteries.
Engineering Focus on Safety and Reliability
Engineers from both companies have modified battery pack architecture and vehicle control systems to satisfy automotive durability and safety standards while maximising battery performance.
The testing programme is designed to confirm that the integrated battery pack can perform consistently under a range of charging and driving scenarios.
“Battery development is a balancing act. It’s not enough to optimize a single metric. We need a system that delivers real benefits in a real vehicle,” said Ned Curic, Stellantis Chief Engineering and Technology Officer.
Collaboration Extends Across Entire Battery Platform
Factorial Chief Executive Siyu Huang described the partnership as a comprehensive development effort covering every stage of the battery system.
Huang said the collaboration involves “deep, full-stack” work spanning from cell chemistry to pack architecture.
The achievement represents another step forward in the companies’ previously announced programme to demonstrate and validate solid-state battery technology for future vehicle applications.
Backed by Major Industry Players
Factorial Energy has attracted support from several prominent strategic investors, including In-Q-Tel, Mercedes-Benz, Stellantis, Hyundai and Kia.
The company develops solid-state battery technologies for a range of sectors, including automotive, defence, aerospace and energy storage markets, through its FEST and Solstice battery platforms.
The latest road-testing milestone highlights growing industry efforts to accelerate the commercialisation of next-generation battery technologies as automakers seek longer driving ranges, faster charging times and improved safety for electric vehicles.