SigmasTek is a leading supplier of Valve Regulated Lead-Acid (VRLA) batteries. SigmasTek products are utilized all over the world for UPS, mobility, medical, emergency lighting, security, telecommunications, and many other critical applications. Our dedicated manufacturing facilities ship over a million batteries per month and have been certified to meet SigmasTek's world class quality and performance requirements. Maintenance Free Batteries with non-spillable design. The SP Series battery is multi-functional for both cycle and standby use.