Question : APC Smart-up 1500 XLM

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?
 

Answer : APC Smart-up 1500 XLM

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