I have a APC Smart-up 1500 XLM, the other day (4 days ago) the power went up and the backup battery just did not work. It was purchase over 4 years ago 04-2006. I've tried logging into the interface to see if there is an area that will tell me if I need to replace the battiries but no such luck. It does state that the system passes, see below:
Self-Test Result: Passed
Self-Test Date: 07/05/2010
Calibration Result: Unknown
Calibration Date: Unknown
Question how can I tell if I should replace battiery? I unplugged it this morning and again the devices I have on it two 3COM 48 port switches just shutdown. Any suggestions?