A Dodge Charger Daytona Becomes the Proving Ground for Solid-State Power

Solid-state batteries have spent years stuck in research labs and slide decks, but Stellantis just moved the conversation onto actual pavement. The company has dropped Factorial’s solid-state cells into a Dodge Charger Daytona and started driving it around to see what happens.

• Stellantis is road testing Factorial’s FEST solid-state cells in a Dodge Charger Daytona EV prototype.
• The validated cells hit 375 Wh/kg energy density with more than 600 charge cycles.
• Benefits could include faster charging, lighter weight, and sharper performance.

From Lab Bench to Public Road

Putting a brand-new battery chemistry into a working car is a big jump. This milestone marks the first integration of Factorial’s FEST (Factorial Electrolyte System Technology) solid-state batteries into a Stellantis vehicle. The partnership behind it isn’t new, though. Stellantis teamed up with Factorial back in 2021, and last year the two announced they had validated the FEST cell technology.

Those validated cells gave engineers something real to work with. Stellantis and Factorial say the battery has an energy density of 375 Watt-hours per kilogram, and the 77-amp-hour cells cleared more than 600 cycles on the way toward automotive qualification. Stellantis called that a milestone for large-format lithium-metal solid-state batteries, which is a mouthful but a meaningful one.

Why It’s Harder Than Swapping Batteries

Fitting these cells into the Charger Daytona’s existing pack wasn’t a plug-and-play job. The engineering team built the cells into modules and then slotted those modules into the production battery pack. To make it work, Stellantis used what it describes as a patented new mechanical architecture meant to get the most out of the solid-state cells.

The team also reworked the control systems and the pack design while keeping automotive safety and durability standards intact. The goal is making sure the cells perform across all kinds of conditions, not just in a climate-controlled test chamber. With the hardware finally in the car, testing and calibration have begun, though Stellantis hasn’t shared any performance results yet. The program is meant to tune and verify pack reliability under both charging and driving, plus confirm that the whole setup stays safe.

What Drivers Could Actually Get

So why bother with all this engineering? The payoff comes down to a few things people genuinely notice. Marty Jagoda, vice president for strategic technology partnerships at Stellantis, laid out the case on the company’s Tech & AI podcast. He pointed to charging speed first, noting that recharging 70% to 80% of your battery in 5, 8, or 10 minutes would be a real advantage at the charger.

Weight is the other big one. Solid-state batteries can pack the same energy into a smaller, lighter package, and that matters more than buyers might think. As Jagoda put it, people don’t shop for a car based on mass, but mass reduction feeds straight into performance, handling, and capability. Shrink the pack while keeping the energy, and the whole car gets lighter.

That logic lands especially well on a muscle car. A lighter Charger Daytona can go faster, turn quicker, and feel more nimble. There’s also flexibility built in. Jagoda mentioned that engineers could instead dial things toward maximum range if that’s what a future model needs. Same technology, different priorities, depending on the vehicle.

A Real Win in a Field Full of Hype

The timing here is worth noting. Solid-state battery promises have a habit of running ahead of reality, and the space recently got a black eye when startup Donut Labs was exposed for faking its cells. Against that backdrop, an actual prototype rolling under its own power carries extra weight. Factorial CEO Siyu Huang framed the achievement as the kind of full-stack collaboration that solid-state has always demanded, spanning cell chemistry through pack architecture.

None of this means solid-state Chargers are showing up at dealerships next month. Road testing is an early step, and there’s a long road between a development mule and a production EV. But getting working cells into a real car, on real streets, separates genuine progress from the press-release variety. For anyone watching where electric performance cars are headed, this is a signal worth tracking.

Stellantis and Factorial still have plenty to prove, and the results will tell the real story. For now, the fact that a solid-state Charger Daytona exists and is logging miles is its own kind of answer.