Keep critical power protection assets in service with the Vertiv PSI PWR Protect EBC 48V YRS1-4. This external battery cartridge is designed to support PSI PWR Protect systems where runtime retention and lifecycle planning matter. For infrastructure teams, that means a cleaner path to maintain backup capacity without overhauling the entire UPS installation. Replacement batteries are a practical investment when the goal is to preserve the value of an existing power platform. Instead of absorbing the cost and disruption of a full unit replacement, this cartridge helps restore the battery subsystem that determines whether protected loads stay online during an outage. That makes it especially relevant for sites with continuity requirements, distributed IT closets, and equipment rooms where downtime carries real operational cost. The 48 V design aligns with the PSI PWR Protect battery architecture and supports planned service intervals across years 1 through 4. Use it to keep spare strategy simple, maintain predictable maintenance cycles, and protect the runtime your UPS was installed to deliver. When uptime is the requirement, battery replacement is the control point.