12V 4-250AH AGM Battery - AGM Deep Cycle Sealed Free Maintenance Lead Acid Battery 1: Deep Cycle Battery with Absorption Glass Mat (AGM) material 2: Valve regulated system for Battery (VRLA) 3: Deep Cycle Battery with Maintenance-free operation 4: Battery with Low self-discharge: Lower than 3%, can be used for UPS, Power Supply Units, Solar/Wind Power System etc. AGM Battery - AGM Deep Cycle Battery Key Features: 1: Long service lifespan: 8 to 12 years design lifespan 2: Low self-discharge: Lower than 3% of rated capacity per month under normal operating temperature 3: ABS case (can be made with flame retardant V0) 4: No memory effect after repetitious usage or discharges 5: Maintenance-free operation 6: Sealed construction and leak proof 7: Safety valve regulated system 8: Operating in any position 9: Deep discharge recovery 10: Wide operating temperature range Applications: 1: Telephone switchboard, electric equipments, medical equipments, instruments, and meters 2: Computer, uninterrupted power source (UPS) 3: Power transmission and transformer station, switch control, and accident lighting 4: Fire fighting, safety device, and alarm monitoring 5: Aviation, spaceflight, and power storage 6: Automatic office system 7: Radio communication system 8: Emergency lighting and car/ship starting system 9: Portable electric appliances and mining system 10: Traffic and navigation signal lamp 11: Solar Power System