Simply connect this external battery pack to an existing APC Smart-UPS X to instantly increase the battery runtime of connected devices during a power outage. Please refer to your APC Smart-UPS X manual to confirm compatibility with this external battery holder. The battery pack can easily be added to an operational APC Smart-UPS via plug-and-play, ensuring power availability while simultaneously increasing runtime capacity. With intelligent battery management and precision charging from 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 for quick addition of multiple battery packs as needed. The battery pack can be mounted in a tower configuration next to an APC Smart-UPS or in a rack-mount configuration beneath the UPS. The package includes the APC SMX48RMBP2U external battery pack, an installation manual, and rack-mount brackets.