Tripp Lite's BP192V18-4U rack/tower external battery pack offers extended battery runtime when used in conjunction with compatible Tripp Lite UPS systems. Multi-use form factor supports configuration in rackmount or stacking applications using only 4 rack spaces (4U). Upright tower configuration supported with optional 2-9USTAND accessory. Includes heavy-gauge cabling with high-current DC connectors for simple installation. Additional output connector allows multiple BP192V18-4U battery packs to be daisy-chained to the UPS for even longer extended run operation.COMPATIBLE UPS SYSTEMS - SU16000RT4U, SU16000RT4UHW, and other Tripp Lite UPS systems that specify the use of this battery pack.