FDK Corporation, originally founded as Fuji Denki Kagaku in 1950, is a Japanese electronics company headquartered in Tokyo, Japan, and a subsidiary of Fujitsu. Its core business focuses on electronic components, batteries, power modules, and magnetic components. Key product lines include alkaline batteries, lithium batteries, nickel-metal hydride batteries, DC-DC converters, AC adapters, inductors, transformers, and power inductors. These products serve consumer electronics, automotive, industrial, and information and communication technology sectors. FDK is recognized for high-reliability battery and power solutions, with notable brands like Fujitsu alkaline batteries. The company maintains a global sales network through subsidiaries such as FDK America Inc., covering North American markets. It holds a significant market position in industrial and portable battery segments. Manufacturing bases are located in Japan, China, and other regions to support global supply. FDK emphasizes energy efficiency, miniaturization, and advanced material technologies. It continues to innovate in power electronics and energy storage solutions for demanding applications.