Mercedes has begun testing an EQS equipped with a solid state battery. It provides 25% more range than a lithium-ion battery of the same size and weight. Solid state batteries offer higher energy densities and safety benefits over traditional batteries.

A version of the Mercedes EQS is testing solid-state cells from Factorial teasing a 25% boost in energy density. Will it really deliver the 621-mile target?

Mercedes-Benz has apparently started testing a solid-state battery from partner Factorial Energy in a modified EQS this month. In the coming weeks, the

Solid-state batteries are expected to be the future of EVs, but they have proven difficult to develop and manufacture on anything close to a commercial scale. Mercedes appears to be moving ahead of the curve,