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The 24V External Battery Pack from APC consists of a unit of four 9Ah batteries that plugs into the rear panel of the 1500VA Back-UPS Pro model. The 1500VA Back-UPS comes with two standard 9Ah batteries. To triple the normal amount of runtime provided by a Pro unit, connect it to an RS Battery Pack. The battery recharges automatically through the unit's internal charger.
The External Battery Pack is compatible with APC's 1500VA Back-UPS Pro models
The vented, flame retardant housing provides durability and efficient thermal management
The heavy duty connector of the battery pack plugs securely into the rear panel of the 1500VA Back-UPS Pro to triple the normal runtime of the UPS