I think you are refering to Aquion Energy. The company sputtered and was sold to a Chinese equity firm. The product looks like it is dead in the water but, it still was a great idea. The intention was to use the cheapest, safest, and most abundent materials to create a battery. It had low power density and output but, they had a solid lifespan and were environmental sound.

https://en.wikipedia.org/wiki/Aquion_Energy