My Tripp-Lite UPS did not provide a long enough backup time (less than 10 minutes), so I added this battery pack. That solved this problem, easy peasy!
Pros: Easy To Set Up, Good Power Output, Long Battery Life, Quiet Operation
This battery pack is heavy, as is to be expected. It is simple to install, as it has one plug, which goes into one's UPS. I'm using an OMNIVS1500XL with it. The runtime seems to be longer, but I haven't tested it extensively with and without the battery pack. I'm assuming it is working. The Tripplite PowerAlert console doesn't acknowledge the presence of the battery pack and doesn't report the runtime. So, I'm not sure it's really working.