FDK Corporation FDK has a long history in battery innovation, starting with the production of carbon-zinc batteries in 1950. Over the years, it has expanded its expertise to include advanced battery technologies such as nickel-metal hydride (Ni-MH) and lithium-ion batteries. The company began focusing on solid-state batteries as a next-generation energy storage solution to address safety, energy density, and durability challenges inherent in conventional lithium-ion batteries. FDK Corporation