A long-anticipated shift in electric vehicle battery technology may finally be taking shape, and a little-known U.S. company is stepping into the spotlight because of it. Factorial Energy, a developer of solid-state batteries for electric vehicles, is preparing to go public in a deal that values the company at around $1.1 billion. The move follows a rare real-world demonstration that suggests solid-state batteries may be closer to everyday use than many skeptics believed.
The company plans to enter public markets through a merger with Cartesian Growth Corporation III, a special purpose acquisition company formed specifically to take private firms public. If the deal closes as expected in mid-2026, Factorial Energy will begin trading on the Nasdaq under the ticker symbol “FAC,” giving investors direct exposure to one of the most closely watched technologies in the EV industry.
A Technology That Has Long Promised More Than It Delivered
Solid-state batteries have been discussed for more than a decade as the successor to today’s lithium-ion cells. Instead of relying on liquid electrolytes, these batteries use solid materials, a change that theoretically allows for higher energy density, lower weight, and improved safety. For electric vehicles, that combination could translate into longer driving range, faster charging, and reduced fire risk.
Despite those potential advantages, solid-state batteries have struggled to move beyond laboratory research. Manufacturing complexities, high costs, and concerns around durability have repeatedly slowed progress. Many companies have claimed breakthroughs, only to fall short when faced with real-world testing or large-scale production.
Factorial Energy’s recent progress has begun to shift that narrative. By pairing technical development with validation from major automakers, the company has moved its technology out of the realm of speculation and into a more credible phase.
A Real-World Test That Caught the Industry’s Attention
The moment that changed Factorial’s trajectory came in September, when a modified Mercedes-Benz EQS equipped with the company’s solid-state battery cells completed a public-road drive of more than 745 miles on a single charge. Notably, the battery was not fully depleted by the end of the journey.
That distance far exceeds the typical range of electric vehicles currently on the market. Even premium long-range EVs often struggle to surpass 400 miles without trade-offs in cost, weight, or performance. The test offered a tangible example of what solid-state technology could deliver if successfully commercialized.
More importantly, the drive took place on public roads rather than in a controlled testing environment, adding credibility to the results and prompting renewed interest from investors and industry observers alike.
Why Solid-State Batteries Could Reshape Electric Vehicles
At the heart of Factorial’s approach is the ability to store more energy in a smaller, lighter package. Solid electrolytes allow battery cells to be packed more tightly, increasing range without requiring larger or heavier battery packs. This efficiency could give automakers greater flexibility in vehicle design while addressing one of the most common consumer concerns about EVs: range anxiety.
Safety is another key advantage. Traditional lithium-ion batteries use flammable liquid electrolytes, which can pose risks under extreme conditions. Solid-state batteries reduce that risk by replacing liquids with stable solid materials, making them appealing to automakers focused on long-term reliability and regulatory compliance.
Factorial’s cells have also demonstrated strong performance across varying temperatures and charging conditions, an essential requirement for vehicles intended for global markets.
Strategic Partnerships With Major Automakers
Factorial Energy is not attempting to manufacture vehicles itself. Instead, the company works as a technology supplier, collaborating directly with established automakers. Its partners include Mercedes-Benz, Stellantis, and Hyundai Motor, companies that together represent a significant share of the global automotive market.
These relationships provide more than just validation. Automaker testing helps ensure the batteries meet real-world requirements, from climate resilience to charging speed. Laboratory evaluations conducted by partners such as Stellantis have confirmed that the cells function effectively in both hot and cold conditions, reinforcing confidence in the technology.
This combination of independent testing and on-road performance has helped differentiate Factorial from other startups still confined to prototype claims.
Inside the $1.1 Billion Listing Plan
Through its merger with Cartesian Growth Corporation III, Factorial expects to raise roughly $100 million to fund its next stage of growth. The transaction places a valuation of about $1.1 billion on the company.
The capital will be used to expand production capabilities, build manufacturing facilities, and continue refining the battery technology. Solid-state batteries remain difficult to produce at scale, and much of Factorial’s challenge now lies in transitioning from successful demonstrations to consistent, high-volume manufacturing.
As a publicly traded company, Factorial will face increased pressure to show measurable progress toward commercialization and revenue generation.
When Drivers Might See These Batteries on the Road
Factorial has indicated that its solid-state batteries could begin appearing in production vehicles as early as 2027. Early adoption is expected to focus on premium or high-performance electric vehicles, where higher costs can be more easily absorbed and longer range provides a clear selling point.
Over time, the company expects broader adoption as manufacturing processes improve and costs decline. This gradual rollout mirrors the path taken by earlier EV technologies, which initially appeared in high-end models before becoming mainstream.
