Keep critical loads online longer when the primary UPS battery bank is not enough. The APC Smart-UPS X 120V External Battery Pack is designed to expand runtime for compatible Smart-UPS X systems in rack or tower environments. For teams protecting servers, storage, network gear, and edge infrastructure, added battery capacity can be the difference between a controlled shutdown and an abrupt interruption. This external battery pack is built for deployments where uptime matters and replacement windows are tight. It supports a cleaner power continuity strategy by extending the available battery reserve without changing the core UPS platform. That makes it a practical fit for data closets, branch offices, and distributed IT sites that need more ride-through time during utility events. As part of the APC Smart-UPS X family, it aligns with enterprise power protection workflows already standardized around APC hardware. The rack/tower design gives flexibility in mixed environments, while the 120V configuration fits common North American power infrastructure. For procurement teams, it is a targeted way to increase resilience without overbuying a larger UPS than the site requires.