Tripp Lite's BP240V500 External Battery Pack offers extended battery runtime when used in conjunction with compatible Tripp Lite UPS systems. Includes 15ft / 4.6m cable to connect to UPS or additional battery pack.COMPATIBLE UPS SYSTEMS: SU20K3/3, SU30K3/3 and other Tripp Lite UPS systems specifying the use of this battery pack Features Offers extended-run UPS operation when used in conjunction with compatible Tripp Lite UPS systems Multiple battery packs can be daisy-chained through each other to the UPS for even longer extended run operation