Mercedes-Benz has achieved a breakthrough in electric vehicle (EV) technology, with a prototype EQS sedan equipped with a solid-state battery travelling 749 miles (1,205 kilometres) on a single charge from Stuttgart, Germany, to Malmö, Sweden. Impressively, the vehicle still had 85 miles (137 kilometres) of range remaining upon arrival, demonstrating exceptional energy efficiency and battery performance.
This milestone surpasses the previous record set by the Vision EQXX concept, which covered 747 miles (1,200 kilometres) from Stuttgart to Silverstone, UK. The journey was carefully optimised using Electric Intelligence, Mercedes-Benz’s route-planning system that accounts for topography, traffic, and ambient temperature to maximise efficiency.
The solid-state battery technology was developed in collaboration with Mercedes-AMG High Performance Powertrains and U.S.-based Factorial Energy. The lithium-metal cells utilise FEST® (Factorial Electrolyte System Technology) and incorporate pneumatic actuators to manage volume changes during charging and discharging, ensuring consistent performance over time. This design increases usable energy content by 25% while keeping the battery’s size and weight comparable to standard EQS batteries. A passive airflow cooling system further reduces energy consumption and overall weight.
Markus Schäfer, Member of the Board of Management of Mercedes-Benz Group AG and Chief Technology Officer, called the development a “gamechanger for electric mobility”, highlighting that the battery’s performance was proven not just in lab tests, but also in real-world conditions.
Mercedes-Benz plans to integrate such solid-state batteries into series production by the end of the decade, offering enhanced range, safety, and comfort for future EV customers. This achievement marks a significant step forward in the company’s commitment to more sustainable and efficient electric mobility.
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