Vertiv Liebert PSI5 72V External Battery Cabinet — 9 Ah Lead-Acid UPS Expansion

Extend the backup runtime of your Vertiv Liebert PSI5 UPS with this external battery cabinet. Designed specifically for use with Liebert PSI5 systems, the cabinet houses 9 Ah lead-acid batteries configured to deliver a 72V output, providing reliable, long-lasting power support for critical equipment. The external enclosure lets you scale runtime without replacing the UPS, making it ideal for network closets, server rooms, and small data centers that require predictable holdover during outages. Uses proven lead-acid battery chemistry for dependable performance and straightforward maintenance. Compatible with existing PSI5 installations to increase runtime capacity while preserving original UPS functionality.