Stellantis & Factorial test FEST solid-state battery

Electromobility Stellantis Conducts Road tests with Solid-State Battery

2026-06-15 From Sven Prawitz | Translated by AI 1 min Reading Time

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Factorial and Stellantis are working together on the solid-state battery. The technology is now being evaluated and improved in road tests using a Dodge Charger Daytona.

Stellantis and Factorial integrate solid-state battery into a Stellantis development vehicle and begin road tests.(Image: Stellantis) — Stellantis and Factorial integrate solid-state battery into a Stellantis development vehicle and begin road tests.
(Image: Stellantis)

Stellantis and Factorial have integrated the "FEST" (Factorial Electrolyte System Technology) cell technology into a development vehicle. A modified Dodge Charger Daytona was selected for the testing program. The aim is to evaluate and improve the battery's performance and reliability under charging and driving conditions, as well as vehicle safety.

Last year, the two companies demonstrated cells with an energy density of 375 Wh/kg, charging from 15 to 90 percent in 18 minutes, and high safety at temperatures from –30 to 45°C (-22°F to 113°F).

Stellantis Adjusts its Battery System

The FEST cells were integrated into the existing battery pack with a newly patented mechanical architecture developed by Stellantis. Additionally, the control systems and pack design were adjusted to improve cell performance while meeting automotive requirements for safety and durability.

"The development of batteries is a balancing act. It's not enough to optimize a single parameter. We need a system that delivers real benefits for real vehicles," emphasizes Ned Curic, Stellantis Chief Engineering and Technology Officer. "Equally important is the strong compatibility of FEST with lithium-ion manufacturing processes, which provides us with a crucial pathway to scaling this technology."

Stellantis has been involved with the company Factorial since 2021, along with automakers Hyundai, Kia, and Mercedes-Benz. The latter OEM drove its EQS model with the start-up's batteries more than 1,200 kilometers (approx. 745 miles) to Malmö—without a charging stop.

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