The VERTIV GXT4-144VBATT is a rack-mountable external battery enclosure designed to extend runtime for compatible UPS systems. This unit contains 12 lead-acid batteries, each with a 9 Ah capacity. It is specifically intended for use with Liebert GXT4 5-6kVA UPS models, providing additional power during outages to support critical IT hardware. It integrates with existing UPS infrastructure to enhance power resilience, ensuring continued operation of connected equipment beyond the standard UPS battery life.