BP36V42-3U 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 stacking, upright tower and rackmount applications using only 3 rack spaces (3U). Includes heavy gauge cabling with high current DC connector for simple installation. Additional output connector allows multiple BP36V42-3U battery packs to be daisy-chained to the UPS for even longer extended run operation.Compatible UPS systems - SMART1500RMXL2Ua, SMX1500RTXL2U and other Tripp Lite UPS systems that specify the use of this battery pack.