Protect electronics from damage caused by outages by ensuring your backup is operating properly. Replacement cartridge features hot-swap functionality for continuous power flow, even during battery changes. Safe, reliable and maintenance-free, it features the absolute minimum number of connections, keeping installation quick and easy. Cartridge #7 (RBC7). Battery Type: Sealed Lead-Acid; Battery Size: RBC7; For Use With: APC® Back-UPS® Series, Smart-UPS® Series; Material(s): Lead-Acid.