Stellantis and Factorial launch road tests for solid-state battery
Stellantis and Factorial Inc. have integrated Factorial's FEST® solid-state battery cells into a Dodge Charger Daytona development vehicle, marking the first automotive integration of the technology in North America. The companies have launched a road-testing program to validate performance, safety, and reliability under real-world conditions. In 2025, the partners demonstrated cells with an energy density of 375 Wh/kg and ultra-fast charging capabilities.
*this image is generated using AI for illustrative purposes only.
Stellantis and Factorial Inc. have integrated Factorial's advanced FEST® (Factorial Electrolyte System Technology) solid-state battery cells into a Dodge Charger Daytona development vehicle and launched a road-testing program to validate performance, safety, and reliability. This milestone marks the first automotive integration of solid-state battery cells in North America and represents a breakthrough step toward automotive-grade application. The collaboration aims to deliver longer range, faster charging, and lower costs for future vehicles.
The integration utilizes a patented mechanical architecture designed by Stellantis to accommodate the solid-state cells within the existing battery pack. Engineers adapted control systems and pack designs to optimize cell performance while meeting rigorous automotive requirements for safety and durability. The testing program will help tune and verify pack performance under charging and driving conditions.
"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. "This milestone shows we are bringing solid-state batteries closer to our customers with the potential for longer range, faster charging and lower costs. Just as important, FEST®'s strong compatibility with lithium-ion manufacturing processes gives us a critical path to scale this technology."
In 2025, Stellantis and Factorial demonstrated FEST® cells with an energy density of 375 Wh/kg. The cells achieved ultra-fast charging from 15% to 90% in 18 minutes and maintained robust reliability across temperatures ranging from -30 °C to 45 °C.
Key Battery Specifications
| Metric | Value |
|---|---|
| Energy Density | 375 Wh/kg |
| Charging Speed | 15% to 90% in 18 minutes |
| Operating Temperature | -30 °C to 45 °C |
"We are deeply honored to work alongside Stellantis, one of the world's great mass-market automakers, on this STLA Large-based development car," said Siyu Huang, CEO of Factorial. "What we have built together, from cell chemistry to pack architecture to enable real-world road testing, is exactly the kind of deep, full-stack collaboration that solid-state has always required."
This milestone marks continued progress on a previously announced multi-stage demonstration program. It serves as an important step in Factorial's ongoing development, calibration, and industrialization of solid-state batteries for automotive use.
What is the projected timeline for moving from this development phase to commercial availability in consumer vehicles?
How will the cost structure of FEST® cells compare to conventional lithium-ion batteries upon mass production?
Will Stellantis expand this solid-state technology integration to other vehicle platforms beyond the STLA Large architecture?
15
Create Custom Screeners 
Access 200+ Pre-built Filters 
Use 50+ Readymade Screener 
