EnerSys is the world's largest industrial battery manufacturer. Headquartered in Reading, PA, USA, EnerSys operates 22 manufacturing and assembly facilities, employs over 7,000 people, and maintains a global sales and distribution network. As a leader in both valve-regulated and flooded lead-acid battery technologies, EnerSys is a major supplier to the telecommunications, UPS, data processing, electronics, and material handling markets worldwide.