A joint testing agreement has been signed between Mercedes-Benz and ProLogium to evaluate ProLogium’s latest Gen4 solid-state battery cells for potential use in future electric vehicles. The testing will focus on electrical, thermal, and safety performance.
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Companies: Mercedes-Benz AG and ProLogium Holding Inc.
Agreement: Joint testing of Gen4 battery cells
Battery: Gen4 Superfluidized Inorganic Next-Generation Lithium Ceramic Battery
Focus: Electrical, thermal and safety testing
Application: Potential future electric vehicles
Partnership: Nearly 10 years of collaboration
Manufacturing: ProLogium’s Taiwan gigafactory and planned Dunkirk facility in France
Dunkirk Capacity: Up to 44 GWh of designed production capacity
Mercedes-Benz, renown luxury car maker in Germany, and ProLogium, a leader in solid state batteries focusing on the development of next-gen batteries are taking another step in their long-running work on next-generation battery technology. The two companies have signed a joint testing agreement that will give Mercedes-Benz priority access to ProLogium’s latest Gen4 super fluidized inorganic next-generation lithium ceramic battery cells. The agreement was announced on September 24, 2026.
The new battery technology will undergo detailed testing at Mercedes-Benz facilities and specialized external testing institutes. The program will focus on electrical, thermal, and safety performance. The results are expected to help Mercedes-Benz assess whether the Gen4 cells could be suitable for future electric vehicle applications.
ProLogium describes its Gen4 battery platform as an effort to balance several important requirements for electric vehicles. These include high energy density, safety, performance, fast charging, high power output, and low-temperature operation.
The non-flammable inorganic electrolyte, ceramic separator technology, and a proprietary active safety mechanism are incorporated in the safety designs. Scalable manufacturing and a competitive cost structure are the targets fixed by the company.
The agreement builds on a partnership that dates back to 2016. Over the years, Mercedes-Benz and ProLogium have worked on battery development, validation, and different cell formats. The pouch cells, prismatic cells, and ProLogium's Bi-Polar technology are in collaboration.
Mercedes-Benz has also invested in ProLogium and has a director on its board. ProLogium is also expanding its manufacturing footprint. Its Taoke Gigafactory in Taiwan has completed GWh-scale manufacturing validation, while its planned Dunkirk facility in France is being developed to support European production. The first phase is designed for 4 GWh of annual production, with the site ultimately planned for up to 44 GWh.
For both companies, the latest testing agreement represents another stage in their effort to move advanced battery technology from development and validation toward potential use in future electric vehicles.