Stellantis integrates solid-state battery into test vehicle

Stellantis (NYSE: STLA) and Factorial Inc. (NASDAQ: FAC) have integrated Factorial's solid-state battery technology into a Dodge Charger Daytona development vehicle and begun road testing to evaluate performance and safety under real-world conditions.

The integration represents the first automotive application of solid-state battery technology in North America, according to the companies. The battery pack uses a mechanical architecture designed by Stellantis to accommodate the solid-state cells.

In 2025, the companies demonstrated FEST solid-state battery cells with an energy density of 375 Wh/kg and charging capability from 15% to 90% in 18 minutes. The cells operated reliably in temperatures ranging from -30°C to 45°C.

"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.

Engineers adapted control systems and pack design to meet automotive safety and durability requirements while optimizing cell performance. The road testing program will verify pack performance and reliability during charging and driving conditions.

Siyu Huang, CEO of Factorial, described the collaboration as "deep, full-stack" work spanning from cell chemistry to pack architecture. The milestone advances the companies' previously announced demonstration program.

Factorial Energy is backed by In-Q-Tel, Mercedes-Benz, Stellantis, Hyundai, and Kia. The company develops solid-state batteries for defense, space, and energy storage applications through its FEST and Solstice platforms.

The information is based on a company press release statement.

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