ProLogium Gen4 battery Enters Mercedes-Benz Testing

ProLogium Gen4 battery technology is moving into a new testing phase with Mercedes-Benz AG after the two companies signed an agreement on September 24. The arrangement gives Mercedes-Benz access to ProLogium’s latest Gen4 cells for electrical, thermal, and safety evaluations at Mercedes-Benz facilities and external testing centers. The collaboration extends a battery-technology partnership that has lasted nearly 10 years. Test results will be used to assess whether the cells could be suitable for future Mercedes-Benz vehicles. The agreement therefore connects ProLogium’s latest cell development with a formal evaluation process focused on performance, safety, and potential vehicle integration.

Mercedes-Benz Begins Gen4 Cell Evaluation

Under the agreement, Mercedes-Benz AG will perform testing across several technical areas rather than relying on a single performance measurement. Electrical testing will examine the cells' operating characteristics, while thermal evaluations will assess behavior under relevant temperature conditions. Safety testing will provide additional information needed to determine suitability for automotive applications. These assessments will take place at Mercedes-Benz facilities as well as external testing centers. The resulting data will support the companies' evaluation of the Gen4 cells and help establish whether the technology can progress toward use in future Mercedes-Benz vehicles.

Gen4 Cell Design Targets Safety and Performance

ProLogium’s Gen4 cells are designed around several performance and safety objectives, including high energy density, strong power output, rapid charging capability, and low-temperature performance. The cell architecture uses a non-flammable inorganic electrolyte together with ceramic separators and an active safety system. These technologies are intended to address both operating performance and safety requirements within an automotive battery system. The combination gives the Gen4 platform a technical profile that Mercedes-Benz can evaluate against the requirements of future vehicle applications. The ongoing testing will determine how the stated cell characteristics translate into measurable results under controlled electrical, thermal, and safety conditions.

Production Validation Supports Further Development

ProLogium’s Taoke Gigafactory in Taiwan has completed production validation at GWh scale, providing a manufacturing base for the next stages of Gen4 development. The facility can support C-sample production, demonstration vehicles, and future commercial production activities. This capability is relevant because cell technology development must progress beyond laboratory-level validation before it can support vehicle programs and larger-scale manufacturing. The Taoke site therefore provides ProLogium with production infrastructure that can support testing, sample preparation, and demonstration activities as the company continues developing its battery technology for potential automotive applications.

Planned Dunkirk Factory Expands European Capacity

ProLogium is also planning a gigafactory in Dunkirk, France, with expected annual capacity of up to 44 GWh. The facility is intended to bring battery manufacturing and related supply-chain operations closer to European customers. Once its first phase is completed, the site could supply commercial cells for electric-vehicle platforms. This planned European production footprint complements the existing validation capabilities in Taiwan and creates a pathway toward regionalized battery supply. The project also provides a potential manufacturing base for future customer programs in Europe, subject to the factory’s development and the successful progression of relevant cell technologies.

Long-Term Battery Partnership Continues

The new testing agreement builds on nearly a decade of battery-technology cooperation between ProLogium Holding Inc and Mercedes-Benz AG. The latest step moves their relationship toward direct evaluation of ProLogium’s newest cell generation, while the testing process provides Mercedes-Benz with technical data for future application decisions. At the same time, ProLogium is developing manufacturing capabilities in both Taiwan and Europe, linking cell validation with potential commercial-scale production. The combination of vehicle-level testing, production validation, and planned European capacity gives the collaboration several development stages to address as the companies evaluate the technology’s automotive potential.

Industry Impact & Outlook

The agreement connects advanced battery-cell development with a major vehicle manufacturer’s formal testing process, making electrical, thermal, and safety validation an important next step before any potential vehicle application. For ProLogium, successful results could support further customer validation and the progression of Gen4 technology toward production programs, while Mercedes-Benz gains additional technical information for evaluating future battery options. The planned 44 GWh Dunkirk facility also creates a potential European supply base if development proceeds as planned. The immediate focus remains testing and validation, with future vehicle use and commercial supply dependent on technical results, production readiness, and subsequent decisions by the companies.

Frequently Asked Questions

What will Mercedes-Benz test in ProLogium’s Gen4 cells?
Mercedes-Benz will evaluate ProLogium’s Gen4 cells through electrical, thermal, and safety testing at its facilities and external testing centers. These assessments are intended to generate technical results that can help determine whether the cells could be used in future Mercedes-Benz vehicles. The Gen4 design targets high energy density, fast charging, high power output, and low-temperature performance while using a non-flammable inorganic electrolyte, ceramic separators, and an active safety system. The testing will provide additional evidence for evaluating these characteristics in an automotive development context and determining potential next steps for the technology.