Overview
- Stellantis integrated Factorial Energy’s FEST semi‑solid cells into a Dodge Charger Daytona development vehicle Thursday, starting North American on‑road testing to tune pack controls and verify vehicle performance under real driving and charging conditions.
- Factorial and Stellantis cite validated cell metrics of about 375 Wh/kg energy density and charging from 15% to 90% in roughly 18 minutes while operating between about −30°C and 45°C, figures reported from prior lab and prototype work.
- Engineers redesigned the pack's mechanical architecture and modified battery controls to fit FEST cells into the STLA Large‑based platform and to meet automotive safety and durability requirements.
- The cells in the Charger use a semi‑solid, gel‑like electrolyte that Factorial says will feed learnings into a future all‑solid Solstice design, and the company has backing from major OEMs including Mercedes, Hyundai, Kia and Stellantis.
- Stellantis and Factorial have not announced a production timetable for vehicles using FEST or Solstice cells, and the road tests are a critical step to assess whether the technology can be scaled into mass‑market cars and change charging and range for drivers.