https://techcrunch.com/2023/10/26/inlyte-energy-seed-round/

It’s not every day that a 50-year-old technology that was long since passed over gets a new lease on life.

Sodium-metal-halide batteries were first patented in the mid-1970s. The design showed promise: It was energy dense and cheap to make. Mercedes-Benz took an interest, investing heavily in research and development. The automaker even tested them in a handful of compact sedans, running tens of thousands of miles per year. In the 1980s, they were the hot chemistry — literally, too, since the cells have to be kept well past the boiling point of water in order to work.