Vertiv Liebert PSI5 UPS 72V External Battery Cabinet 9 Ah Lead-Acid - 3-Year Warranty | 2U | Designed for Vertiv Liebert PSI5-3000RT120 and PSI5-5000RT208

You can connect to 6 battery cabinets to a Vertiv Liebert PSI5 UPS. The batteries are valve-regulated, non-spillable, lead acid and should be kept charged to attain their design life. Extended warranties are available for 1 year (1WEPSI5-72VBATT) and 3 years (3WEPSI5-72VBATT). External battery cabinets provide longer battery run-time for connected devices. This product is heavy and/or oversized and may need more than one person to handle.