APC Replacement Battery Cartridge #4 - Maintenance-free Lead Acid Hot-swappableBattery Type: Maintenance-free Lead Acid Hot-swappableBattery Life: 3 Year to 5 YearOutput Voltage: 12 V DCHeight: 3.9Width: 3.7"Depth: 5.9"Weight (Approximate): 8.10 lbCompatibility: APC:BK650MC - Back-UPSBK650X06 - Back-UPSBP650IPNP - Back-UPS ProBP650PNP - Back-UPS ProBP650S - Back-UPS ProBP650SC - Back-UPS ProSU620NET - Smart-UPSSUVS650 - Smart-UPS VSLimited Warranty: 1 Year"