Apc - Schneider RBC55, Sealed Lead-Acid RBC55 Battery, Hot-Swappable, 3 to 5 Year Expected Battery Life, Includes Two RBC #55 Batteries, Capacity 816 VAh, Lead-Acid. Designed for home offices, small businesses, and IT departments, the Replacement Battery Cartridges #55 from APC is a replacement battery pack for select APC Smart-UPS and Back-UPS models that support computers, network systems, and more.