APC Smart-UPS SRT 72V 2.2kVA Battery Pack - Sealed Lead Acid - Leak Proof/Maintenance-free - Hot Pluggable - 3 Year Minimum Battery Life - 5 Year Maximum Battery LifeBattery Characteristics: Leak Proof/Maintenance-freeBattery Chemistry: Sealed Lead AcidHot Pluggable: YesMinimum Battery Life: 3 YearMaximum Battery Life: 5 YearHeight: 17Width: 3.3"Depth: 23.4"Weight (Approximate): 74.74 lbCompatibility: APC Smart-UPS SRT"