Simply attach this external battery pack to an existing APC Smart-UPS X to instantly increase the battery runtime of connected equipment during a power outage. Simply attach this external battery pack to an existing APC Smart-UPS X to instantly increase the battery runtime of connected equipment during a power outage. Please consult your APC Smart-UPS X manual to confirm compatibility with this external battery pack. The battery pack simply plugs into a running APC Smart-UPS via a plug-and-play connection, securing power availability while increasing runtime capacity. Through the intelligent battery management and precision charging of the APC Smart-UPS, the battery pack maintains the performance, reliability, and lifespan of the UPS system. The APC battery pack offers scalable runtime for the APC Smart-UPS X, allowing multiple battery packs to be quickly added as needed. The battery pack can be mounted both in a tower configuration next to an APC Smart-UPS and in a rack-mount configuration below the UPS. Package includes APC SMX48RMBP2U External Battery Pack, installation guide, and rack-mounting brackets.