Overview

• The lightly modified sedan finished with about 85 miles remaining after driving from Stuttgart to Malmö on Germany’s A7 and Denmark’s E20 highways without ferries.
• Mercedes says the prototype pack delivers roughly 25% more usable energy than the standard EQS battery at similar weight and size.
• Route planning used the car’s Electric Intelligence system to factor in topography, traffic, temperature and HVAC loads, though average speed and trip time were not disclosed.
• The cells come from Factorial Energy, whose nearer‑term FEST design uses a quasi‑solid polymer electrolyte, while the all‑solid Solstice concept would need new dry‑coating lines.
• Mercedes targets bringing solid‑state packs to series production by the end of the decade, framing this drive as real‑world validation rather than consumer‑rated range.