Stellantis Advances Solid-State Battery Testing with Factorial FEST Technology in Dodge Charger Daytona

Stellantis and Factorial Inc. announced on June 11 the successful integration of advanced FEST (Factorial Electrolyte System Technology) solid-state battery technology into a Dodge Charger Daytona development vehicle. The milestone also marks the launch of a dedicated road-testing program aimed at assessing battery performance, safety, and long-term reliability under real-world operating conditions. This achievement represents an important step in the commercialization of next-generation battery technologies as automakers seek higher energy density, faster charging capability, and improved operating stability for electric vehicles.

First Vehicle Integration of FEST Solid-State Cells

Following earlier validation of automotive-scale FEST cells, this development marks the first time solid-state battery cells have been integrated into a vehicle developed by Stellantis. The engineering teams from both companies collaborated extensively to transition laboratory-proven battery technology into an operational vehicle platform. The integration demonstrates progress toward deploying advanced battery systems in production-ready applications while enabling engineers to collect valuable data from real-world usage scenarios.

Advanced Battery Performance Demonstrated in 2025

In 2025, the companies demonstrated FEST cells delivering an energy density of 375 Wh/kg. The battery technology also achieved ultra-fast charging capability, increasing state of charge from 15% to 90% in only 18 minutes. In addition, the cells maintained robust operational reliability across temperatures ranging from -30 °C to 45 °C. These characteristics highlight the potential of solid-state batteries to address major electric vehicle challenges including charging time, energy storage efficiency, and performance in varying climates.

Innovative Battery Pack Architecture Supports Integration

Moving from laboratory validation to vehicle deployment required new engineering solutions from both organizations. FEST solid-state cells were incorporated into the existing battery pack through a patented mechanical architecture designed by Stellantis. The new design was developed specifically to optimize the performance of solid-state cells while ensuring compatibility with vehicle systems. This approach enables evaluation of advanced battery technology without requiring a completely new vehicle platform architecture.

Road Testing Program to Verify Reliability

The companies have already initiated road testing and calibration activities to tune and verify battery pack performance across different charging and driving conditions. Data generated during these evaluations will support optimization of battery behavior, durability, and safety characteristics. The program represents an important phase in validating solid-state battery technology for future commercial deployment and could accelerate the transition toward higher-performance electric vehicles.

Frequently Asked Questions

What is FEST solid-state battery technology?
FEST, or Factorial Electrolyte System Technology, is a solid-state battery platform developed to deliver higher energy density, faster charging, and improved safety compared with conventional lithium-ion batteries. The technology demonstrated 375 Wh/kg energy density and the ability to charge from 15% to 90% in 18 minutes. It also maintained reliable operation across a broad temperature range from -30 °C to 45 °C, making it suitable for automotive applications in diverse environments.

Why is the Dodge Charger Daytona testing program significant?
The Dodge Charger Daytona development vehicle represents the first integration of FEST solid-state battery cells into a Stellantis vehicle for real-world evaluation. The road-testing program enables engineers to assess battery performance, safety, durability, and charging behavior under actual driving conditions. Successful validation could accelerate commercialization of solid-state batteries, supporting the next generation of electric vehicles with improved range, efficiency, and charging convenience.