Stellantis and Factorial Integrate Advanced Solid-State Battery into Stellantis Development Vehicle and Launch Road Testing

Stellantis and Factorial (Nasdaq: FAC) have integrated Factorial's FEST® solid-state battery cells into a Dodge Charger Daytona development vehicle, the first such automotive integration in North America.

Rhea-AI Summary

Stellantis and Factorial (Nasdaq: FAC) have integrated Factorial's FEST® solid-state battery cells into a Dodge Charger Daytona development vehicle, the first such automotive integration in North America. A road-testing and calibration program is underway to validate performance, safety and reliability, advancing Factorial’s solid-state battery industrialization for automotive use.

Positive

• First integration of FEST® solid-state cells into a Stellantis vehicle
• Road-testing and calibration program for FEST® pack now underway
• Previously demonstrated FEST® energy density of 375 Wh/kg
• Fast charging from 15% to 90% in 18 minutes demonstrated in 2025
• Validated operation from -30 °C to 45 °C in prior FEST® tests
• Patented Stellantis pack architecture enables solid-state cell integration

Negative

• None.

Argus Jun 11 session

+4.87% close to close Open Argus

Details

News Market Reaction – STLA

On Jun 11, the day this news came out, STLA closed 4.87% above the previous close.

Data tracked by StockTitan Argus for the Jun 11 session.

Key Figures

Energy density: 375 Wh/kg Fast charge window start: 15% Fast charge window end: 90% +3 more

Energy density

375 Wh/kg

FEST solid-state cells demonstrated in 2025

Fast charge window start

15%

State of charge for start of 15–90% fast charge

Fast charge window end

90%

State of charge for end of 15–90% fast charge

Fast charge time

18 minutes

Charging from 15% to 90% in FEST cell demonstration

Low operating temperature

-30 °C

Lower bound of FEST reliability temperature range

High operating temperature

45 °C

Upper bound of FEST reliability temperature range

Historical Context

5 past events · Latest: Jun 09

5 events

1. Jun 09

   Brand marketing launch

   24h Move

   -0.3%

   Launch of Dodge Charger Fragrance as a themed branding product.

2. Jun 02

   Product lineup update

   24h Move

   -1.8%

   Unveiling of 2027 Dodge Charger multi‑energy lineup and pricing.

3. Jun 02

   SUV lineup refresh

   24h Move

   -1.8%

   Announcement of 2027 Dodge Durango HEMI V‑8 lineup and options.

4. Jun 01

   Marketing campaign

   24h Move

   -2.0%

   Jeep and Marvel collaboration for 2026 Summer of Jeep campaign.

5. May 21

   Investor framework

   24h Move

   +0.4%

   Presentation of FaSTLAne 2030 plan with long‑term financial targets.

24h Move is the share-price change in the day after each event; other market factors may also have contributed.

Key Terms

solid-state battery, energy density, lithium-ion, mechanical architecture

4 terms

solid-state battery technical

"advanced solid-state battery cells into a Stellantis development vehicle"

A solid-state battery is a type of rechargeable battery that uses a solid material instead of liquid or gel-like substances to store and transfer energy. This design can make batteries safer, more durable, and capable of holding more power in a smaller space. For investors, advancements in solid-state batteries could lead to better-performing electric vehicles and portable electronics, potentially transforming markets and creating new opportunities.

energy density technical

"demonstrated FEST® cells with an impressive energy density of 375 Wh/kg"

Energy density measures how much energy is stored in a material or object relative to its size or weight. For example, a small, lightweight battery with high energy density can store a lot of power, making it more efficient and longer-lasting. Investors pay attention to energy density because it influences the performance, cost, and practicality of energy sources and storage solutions.

lithium-ion technical

"FEST®'s strong compatibility with lithium-ion manufacturing processes"

A type of rechargeable battery chemistry that stores and releases energy by moving lithium ions between two electrodes; think of it as a lightweight, refillable fuel tank for electronics and vehicles. It matters to investors because lithium‑ion batteries are central to smartphones, electric vehicles and grid storage, driving demand for raw materials, manufacturers and related supply chains, and influencing costs, growth prospects and regulatory attention.

mechanical architecture technical

"battery pack leverages a patented mechanical architecture to accommodate solid-state cells"

Mechanical architecture is the organized layout and interaction of physical parts in a product or device — how components are arranged, supported, and connected to perform a function. For investors, it matters because a thoughtful mechanical architecture can lower manufacturing costs, improve reliability and ease of repair, and speed product development, all of which affect profit margins, time to market, and long‑term product competitiveness. Think of it as the product’s blueprint for moving and holding its parts together.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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AMSTERDAM and BOSTON, June 11, 2026 /PRNewswire/ --

• Stellantis has incorporated Factorial's advanced solid-state battery cells into a Stellantis development vehicle - the first automotive integration of the technology in North America
• Road testing now underway to validate performance, safety and reliability under real-world conditions
• Battery pack leverages a patented mechanical architecture to accommodate solid-state cells
• Milestone marks the first vehicle in the previously announced multi-stage development vehicle program

Stellantis and Factorial Inc. (Factorial) (Nasdaq: FAC) have reached a significant milestone: the integration of Factorial's advanced FEST® (Factorial Electrolyte System Technology) solid-state battery technology into a Dodge Charger Daytona development vehicle and the launch of a road-testing program to verify performance, safety and reliability. Building on previous validation of automotive-scale FEST® cells, this achievement marks the first integration of solid-state cells into a Stellantis vehicle and a breakthrough step towards automotive-grade application.

"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 impressive energy density of 375 Wh/kg, ultra-fast charging from 15% to 90% in just 18 minutes and robust reliability from -30 °C to 45 °C.

Transitioning from these cell testing results to a development vehicle demanded advanced engineering solutions from Stellantis and Factorial engineers. FEST® solid-state battery cells were integrated into the existing battery pack using an innovative, patented new mechanical architecture, designed by Stellantis, to bring out the best of solid-state cell performance. Engineers also adapted the control systems and pack design to optimize cell performance while meeting rigorous automotive requirements for safety and durability. These technical designs and adaptations are essential for ensuring cell performance in all conditions.

With this integration milestone complete, Stellantis and Factorial have started a road testing and calibration program. The testing program will help tune and further verify pack performance and reliability under charging and driving conditions, in addition to vehicle safety.

"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 doesn't just validate FEST®; it sets a new bar for what automotive-grade solid-state batteries can deliver and supports the development of future vehicles designed to meet the evolving needs of drivers."

This milestone marks continued progress on Stellantis and Factorial's previously announced demonstration program, as well as an important step in Factorial's ongoing development, calibration and industrialization of solid-state batteries for automotive use.

About Factorial Energy
Factorial Energy (Nasdaq: FAC) is a leading American solid-state battery innovator backed by In-Q-Tel - the not-for-profit strategic investor for the U.S. national security community and America's allies - and Mercedes-Benz, Stellantis, Hyundai, and Kia. Through its proprietary FEST® and Solstice™ platforms, engineered for scalable manufacturing, Factorial delivers industry-leading performance across defense, space, and energy storage applications. Mercedes-Benz' real-world road testing in a lightly modified test vehicle achieved over 1,200 km of range on a single charge, while Stellantis-lab testing verified 77 Ah cells demonstrating high energy density, fast-charging, and robust use for energy and power performance across temperature extremes. For more information, visit factorialenergy.com.

Stellantis
Stellantis (NYSE: STLA / Euronext Milan: STLAM / Euronext Paris: STLAP) is a leading global automaker, dedicated to giving its customers the freedom to choose the way they move, embracing the latest technologies and creating value for all its stakeholders. Its unique portfolio of iconic and innovative brands includes Abarth, Alfa Romeo, Chrysler, Citroën, Dodge, DS Automobiles, FIAT, Jeep®, Lancia, Maserati, Opel, Peugeot, Ram, Vauxhall, Free2move and Leasys. For more information, visit www.stellantis.com.

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SOURCE Stellantis

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What did Stellantis and Factorial (NASDAQ:FAC) announce on June 11, 2026?

Stellantis and Factorial announced integration of FEST® solid-state battery cells into a Dodge Charger Daytona development vehicle and the start of road testing. According to Factorial, this is the first such integration in North America and a key step toward automotive-grade solid-state applications.

What is Factorial's FEST solid-state battery technology and its key performance metrics?

FEST® is Factorial’s solid-state battery technology designed for automotive use. According to Factorial, 2025 demonstrations showed energy density of 375 Wh/kg, ultra-fast charging from 15% to 90% in 18 minutes, and robust reliability across temperatures from -30 °C to 45 °C.

Which Stellantis vehicle uses Factorial's FEST solid-state battery in the new tests?

Factorial’s FEST® solid-state cells are integrated into a Dodge Charger Daytona development vehicle based on the STLA Large platform. According to Factorial, this development car is part of a multi-stage demonstration program aimed at validating performance, safety and durability for future automotive applications.

What does the new road-testing program mean for Factorial (FAC) solid-state batteries?

The road-testing program moves FEST® batteries from cell-level validation into real-vehicle evaluation. According to Factorial, engineers will tune and verify pack performance, safety and reliability under actual charging and driving conditions, supporting ongoing development, calibration and industrialization for automotive use.

How are Stellantis and Factorial integrating solid-state cells into existing EV battery packs?

Stellantis designed an innovative, patented mechanical architecture to host FEST® solid-state cells in an existing pack. According to Factorial, engineers also adapted control systems and pack design so the cells can meet rigorous automotive safety, durability and performance requirements in a development vehicle.

Why is the Stellantis collaboration important for Factorial (FAC) investors?

The collaboration places FEST® solid-state cells in a mass-market automaker’s development vehicle. According to Factorial, strong compatibility with existing lithium-ion manufacturing processes offers a potential path to scale, positioning the technology for future automotive-grade deployment if development and industrialization progress successfully.