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Mercedes Begins Solid-State Battery Road Tests With 621 Miles (1,000 km) Of Range
Mercedes-Benz begins solid state battery road test with 621 miles (1,000 km) fitted into modified all-electric EQS test car.
Battery far exceeds the 497 miles (800 km) provided by the 118 kWh battery pack in the regular EQS 450+.
The prototype solid-state battery was co-developed by Mercedes Center of Competence for Battery Systems together and HPP.


German luxury carmaker, Mercedes-Benz, has announced the start of road tests with a new prototype lithium-metal solid-state battery integrated into a slightly modified EQS (electric S-Class) test car.
The prototype solid-state battery with cells from Factorial was co-developed by Mercedes‑Benz Center of Competence for Battery Systems with the motorsport experts from HPP.


Battery far exceeds the 497 miles (800 km) provided by the 118 kWh battery pack in the regular EQS 450+.
The battery is expected to allow the prototype EQS to go up to 621 miles (1,000 km), which far exceeds the 497 miles (800 km) provided by the 118 kWh battery pack in the regular EQS 450+.

Mercedes says that the prototype solid-state battery uses a solid electrolyte instead of a liquid one, which enhances cell safety and allows for the use of new anodes like lithium metal.
“We’re excited to announce that we’ve started road testing with a prototype vehicle equipped with this advanced technology. We will gain crucial insights into possible series integration of this cutting-edge battery technology,” Mercedes said in a statement.

The solid-state battery in the modified EQS test vehicle allows for up to 25 percent more driving range, compared to the same battery weight and size of battery in the standard EQS.
“Being the first to successfully integrate lithium metal solid-state batteries into a production vehicle platform marks a historic achievement in electric mobility. Our collaboration with Mercedes-Benz proves that the future of electric vehicles is not just a vision, but a reality we’re delivering today, ” said Siyu Huang, CEO and Co-Founder of Factorial Energy.
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