Solid-state batteries have the potential to make EVs far more affordable and practical, but their commercial development has a record of false promises that would make Tesla's full self-driving blush.

Mercedes-Benz is doubling down on solid-state EV batteries with ultra-long range and fast charging capabilities for its next-gen vehicles.

Mercedes and Factorial on Tuesday jointly announced they are working on a solid-state battery that they expect to be in production by the end of the decade. Known as Solstice, the battery has an energy density of 0.

Mercedes-Benz has been collaborating with a company called Factorial Energy and together, they’ve refined the Solstice. And the Solstice will help Mercedes-Benz in its aims to have solid-state batteries in its cars by 2030.