APC Replacement Battery Cartridge #3 - Maintenance-free Lead Acid Hot-swappableBattery Type: Maintenance-free Lead Acid Hot-swappableBattery Life: 3 Year to 5 YearOutput Voltage: 6 V DCHeight: 4Width: 3.7"Depth: 5.9"Weight (Approximate): 8.10 lbCompatibility: APC:450ATBK450BK520BK575CBK600BK600CBK650MPCNETLimited Warranty: 1 Year"