Keep essential systems online when utility power becomes unstable. The Vertiv Liebert PSI5 Lithium-Ion UPS is built for IT environments that need compact protection without giving up runtime planning or deployment flexibility. With 2,200 VA capacity, it is sized for network gear, edge systems, and smaller server loads that still demand disciplined power continuity. Lithium-ion battery technology changes the maintenance profile. Compared with traditional battery approaches, it supports a lighter operational burden and is well suited to teams that value long service life and reduced replacement frequency. The 2U rack/tower format makes it easier to fit into constrained spaces, whether the unit is installed in a rack, under a desk, or in a communications closet. This model is a strong fit for organizations that need dependable backup power in a compact footprint and must align with TAA-oriented procurement requirements. It is not about excess capacity; it is about the right capacity, in the right form factor, for infrastructure that cannot afford avoidable downtime.