Apc - Schneider Prem RBC34, Cells-4, Capacity 84 VAh, Lead-Acid, FF 1 RU, Hot-swappable, Compatible with an intelligent battery management system. The Replacement Battery Cartridge #34 from APC replaces the original battery in your UPS to restore backup power performance for 3 to 5 years. With hot-swappable support, the battery can be installed without shutting down critical systems.