The Vertiv Liebert GXE3-EBC72VRT2U is a hot-swappable, lead-acid UPS external battery cabinet (EBC) designed for use with GXE3-3000IRT2UXL UPS systems. The capability to add external battery cabinets provides scalable runtime for those applications requiring even a longer period of backup in case of AC mains failures. Up to 4 battery cabinets can be mounted in a flexible rack or tower form factor.