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 & maintenance-free, it features the absolute minimum number of connections, keeping installation quick & 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.