Did you ever get an intelligent response to your inquiry noted below?? Am now looking for a replacement battery for the same. "Inland - by ABI International". Model is "Probackup5000", part number is 19500. It has a DB9 serial port on the back for interfacing with a host to notify it of loss of ac, impending shutdown, etc. However, I don't have the software (for Windoze) that came with it. I've googled for hours, and can't come up with anything on this exact unit. Would anyone happen to have windows software for it? As a last resort, how standard is the DB9 pinout (IF I can find the pinout, no luck there either)... I'm wondering if I can use just about any UPS software for it. Any advice?