Energizer Holdings, Inc. is an American manufacturer and one of the largest battery manufacturers in the world, headquartered in St. Louis, Missouri. As of 2021, Energizer currently has six operating facilities in the United States. It also has operating facilities in Singapore since 1946, targeting the Asian and Oceania markets. Singapore is home to Energizer's largest international facility and the only Energizer facility outside the United States capable of producing both alkaline and lithium batteries.