Keep essential equipment running through power disturbances with the Vertiv Liebert PSI5 Lithium-Ion 1500VA UPS. This rack-tower unit is built for 120 VAC environments and delivers 1,500 VA / 1,350 W of backup capacity for smaller server rooms, network closets, and edge deployments where uptime still matters, but rack space is limited. The lithium-ion battery design is a strong fit for teams that want a modern battery platform in a compact UPS footprint. Compared with traditional lead-acid systems, lithium-ion configurations are often selected for longer service life and reduced maintenance burden, making them attractive in distributed IT environments where service visits are costly. The rack-tower format also gives you flexibility to install it in a cabinet or use it as a tower when floor placement is the better operational choice. For procurement teams, this model sits in the right place when the goal is to protect critical loads without oversizing the UPS or paying for capacity that will never be used. It is a practical choice for branch infrastructure, communications gear, and compact server deployments that need clean power, efficient use of space, and a battery platform suited to long-term ownership.