For Information on which battery packs are compatible with your UPS or what estimated runtimes will be for your configuration, please visit the product page for you UPS at http://www.apc.com
When using Powerchute Network Shutdown 2.2.4 and Network Management Card 2 UPS application firmware revision apc_hw05_sumx_v5.0.3 (sfsumx503), selecting the option to turn off the UPS via PowerChute Network Shutdown is supported for only the 'On Battery' and 'Low Battery' UPS events on certain Smart-UPS models.
Although the Surge Arrest, Back-UPS, Back-UPS Pro, Smart-UPS, Smart-UPS V/S, and Symmetra LX products may appear to work properly without a ground, APC always recommends that these units are grounded properly.