Mercedes-Benz has set a new benchmark in electric mobility after its EQS solid-state prototype covered 749 miles (1,205km) without stopping to charge.

The EQS solid-state prototype covered 749 miles without stopping to charge

Continuing the German brand’s real-world testing of solid-state battery technology, a lightly modified EQS test vehicle equipped with a lithium-metal solid-state battery was driven across three countries without a single charging stop.

The electric saloon actually completed its landmark journey, from Stuttgart in Germany through Denmark and onto Malmö in Sweden, with 85 miles (137km) of range left. It also beat the previous record set by the Vision EQXX on its Stuttgart–Silverstone route by 3km.

Mercedes said this combination of long range, efficiency and technological maturity marks a milestone for solid-state battery development and highlights its potential for future production vehicles.

The solid-state battery system was developed in close collaboration with Mercedes-AMG High Performance Powertrains (HPP), the Formula 1 technology centre of the Mercedes-Benz Group in Brixworth, UK. The lithium-metal cells used in the vehicle come from US-based manufacturer Factorial Energy and are based on FEST technology (Factorial Electrolyte System Technology).

The weight and size of the battery remain comparable to the standard EQS battery although the usable energy content of the battery is up by 25%.

The optimal route was calculated using Electric Intelligence, factoring in topography, traffic, ambient temperature and energy needs for heating and cooling – without using ferries.

Markus Schäfer, chief technology officer, said: “The solid-state battery is a true gamechanger for electric mobility. With the successful long-distance drive of the EQS, we show that this technology delivers not only in the lab but also on the road. Our goal is to bring innovations such as this into series production by the end of the decade and offer our customers a new level of range and comfort.”