POWERSTAR Replacement Battery for APC IBM Belkin UPS Backup Systems ES500 ES550 PowerStar Brand--12V 9AH Sealed Lead Acid Battery with T2 Terminals 5.94in (length), 2.56in (width), 3.72in (height); 13.16lbs 3 Year Warranty, 30-Day Money Back Guarantee Sealed AGM design makes batteries leak free Maintenance free high performance Sealed Lead Acid (SLA) batteries