Add runtime where it matters most. The Vertiv Liebert PSI5 72V External Battery Cabinet is designed to extend backup capacity for compatible PSI5 UPS deployments, helping preserve uptime for servers, network gear, and edge infrastructure during power interruptions. For teams that need more than the standard internal battery window, this cabinet provides a practical way to increase ride-through time without changing the UPS platform. Built for environments where continuity and procurement requirements both matter, this model is TAA compliant and suited to government and regulated deployments. It is a strong fit when a standard UPS battery pack is not enough to cover graceful shutdowns, generator transfer delays, or short utility disturbances. By adding external battery capacity, you can better match runtime to the actual risk profile of the site. This is the kind of accessory that earns its place in a serious power architecture: purpose-built, compatible, and focused on extending protection rather than replacing the UPS itself. For infrastructure teams standardizing on Vertiv PSI5, it offers a cleaner path to longer runtime and more predictable recovery planning.