External battery pack offers extended battery runtime when used in conjunction with compatible UPS systems. Multi-use form factor supports configuration in rackmount or stacking applications using only 4 rack spaces. 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. Additional battery packs may be ordered at time of original UPS purchase or sourced at a later date to extend runtime performance if site power conditions deteriorate and longer battery runtime is desired. Single-user replaceable sealed, flame-retardant, non-spillable battery modules. Connects to UPS via detachable cable with UPS specific DC connector, 40.6cm length, 4 gauge cables.