This is a replacement SLA battery for PS-1250-F2, HR1221W, RT1250-F2, NP4-12-F2, HR5.8-12 and UB1250-F2 (D5777). This is a 12V 5.5AH sla battery. We supply only brand new, factory fresh, high quality batteries. We guarantee the best price and 100% compatibility with your OEM model. The replacement sla batteries also include a minimum of one year warranty. Popular applications for our sla batteries are UPS, emergency lighting, security, fire and burglar alarms, scooters, wheelchairs, medical, and other.