While Chinese manufacturers have burst out in front of the pack with semi-solid-state battery achievements, other manufacturers around the world are working hard to get their own cells developed and validated. Based in Massachusetts, Factorial Energy has been working on its lithium-metal quasi-solid-state technology for over a decade, attracting backing and collaboration from major automakers like Stellantis, Mercedes-Benz and Hyundai. It's aiming for a long-range, energy-dense battery that costs the equivalent of lithium-ion units and rolls off the same production lines. This month, it sent out its first round of B-samples to Mercedes-Benz for further testing and development. Factorial first...