BP72V28RT-3U rack/tower external battery pack offers extended battery runtime when used in conjunction with compatible Tripp Lite systems. Multi-use form factor supports configuration in rackmount or stacking applications using only 3 rack spaces (3U). Upright tower configuration supported with optional 2-9USTAND accessory. Includes heavy gauge cabling with high current DC connector for simple installation. Additional DC connector enables the daisy-chaining of multiple external battery packs for longer extended run capability.