APC Smart-UPS XL protects your data by supplying reliable, network-grade power with scalable run-time in tower and rack mount form factors. With optional, matching battery packs, run-time can be easily extended and optimized for the application. APC understands long run-time requirements so; Smart-UPS XL's can be configured with up to 10 additional battery packs - for run-times exceeding 24 hours, if necessary. The convergence of voice and data networks is placing higher demands on availability expectations - and the Smart-UPS XL delivers. Voice over Internet Protocol (VoIP), e-commerce, WiFi ("hotspots", WLAN/ WWAN, and mixed wireless), and data enabled PBX's are a few of the applications driving the need for Smart-UPS XL. APC Smart-UPS XL is also the perfect UPS for fileservers (Intel or UNIX based), minicomputers, Network switches and hubs, ATM's, telecommunications systems and other mission-critical applications requiring longer runtime.