The APC SRT192BP is an external extended-run battery pack for APC's Smart-UPS SRT online UPS range, specifically listed as compatible with the SRT5KRMXLI, SRT5KXLI, SRT6KRMXLI and SRT6KXLI models (5kVA and 6kVA units, both tower and rack-mount variants). At a rated capacity of 1920VAh, it extends how long the connected UPS can keep supplying power during an outage well beyond the runtime the UPS's own internal battery alone provides — important for sites that need to ride out longer load-shedding stages or generator start-up delays, not just a brief mains blip. It supports the SURTRK2 rackmount kit for rack installations, and is a compatible add-on/expansion battery rather than a standalone UPS.