BP48V48RT4U shallow-depth rackmount external battery pack offers extended battery runtime when used in conjunction with compatible Tripp Lite UPS systems. Supports configuration in rackmount applications using only 4 rack spaces (4U). Includes heavy gauge cabling with high current DC connector for simple installation. Additional output connector allows multiple BP48V48RT4U battery packs to be daisy-chained to the UPS for even longer extended run operation. Includes hardware for 2-post rackmount installation and supports optional 4-post rackmount installation with addition of UPSRMRII accessory kit. Ideal for installation in wiring closet applications.COMPATIBLE UPS SYSTEMS - SMART1500CRMXL, SMART2200CRMXL, SMART3000CRMXL, and other Tripp Lite UPS systems that specify the use of this battery pack. (Note: BP48V48RT4U, SMART2200CRMXL and SMART3000CRMXL include hardware for 2-post rackmount installation; most other rackmount UPS systems and battery packs include hardware for 4-post rackmount installation.)