EnerSys is headquartered in Reading, Pennsylvania, USA, and is the world's largest manufacturer of industrial batteries. We have 22 manufacturing and assembly plants, more than 7,000 employees, and a global sales and distribution network. EnerSys is the world's leading leader in valve control and flooded lead-acid battery technology. Not only that, EnerSys is also the most important supplier in the global telecommunications, UPS, data processing, electronics and material processing markets.