MADISON, Wis.--(BUSINESS WIRE)--Spectrum Brands Holdings, Inc. (NYSE: SPB), a diversified and global consumer products company with market-leading brands, announced today its Rayovac® global battery division, the world’s number-one selling hearing aid battery producer, will make another multi-million dollar investment over the next year in research and development and in its manufacturing plants to meet growing demand for the world’s longest-lasting, mercury-free hearing aid batteries.
