APC SRT48BP is a Smart-UPS SRT 48V 1kVA 1.5kVA external battery pack. SRT48BP has an extended-run battery system that provides flexible run-time to critical Smart-UPS applications.Multiple battery pack configuration where you can connect up to 10 battery packs for extended runtime applications. Advanced battery management is included. Embedded monitoring at the cell, module, and cabinet level provides a clear picture of battery runtime and health, with the added benefits of predictable, consistent runtime performance and stable cell health.