This battery technology is projected to deliver an impressive 620 miles (1,000 kilometres) of range on a single charge, marking a significant advancement over current lithium-ion batteries.

The prototype has transitioned from laboratory experiments to real-world testing, with road tests commencing in February 2025.

Mercedes-Benz engineers and Factorial's cell experts have worked diligently to integrate this  battery into the EQS platform, aiming to enhance performance and safety.

Solid-state batteries, which utilise a solid electrolyte instead of the traditional liquid, offer higher energy density and improved safety features.

CEO and Co-Founder of Factorial Energy Siyu Huang said: “Being the first to successfully integrate lithium metal solid-state batteries into a production vehicle platform marks a historic achievement in electric mobility.”

Mercedes-Benz and Factorial Energy are collaborating to develop a battery with an energy density of 450 watt-hours per kilogram, potentially doubling the capacity of existing batteries.

This extends the vehicle's range and contributes to weight reduction and enhanced efficiency.

The prototype's battery is based on Factorial's proprietary FEST (Factorial Electrolyte System Technology) cells, which incorporate a quasi-solid electrolyte. These cells combine the benefits of solid-state technology with the manufacturability of conventional lithium-ion batteries.