Over time UPS batteries wear out; this leads to a loss of power capacity and runtime. You can test your APC UPS to see if it is time to change your battery.
APC Symmetra RM 2-6 kVA Battery Module is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by Satisfied IT Manager from SIX YEARS. NOT A PROBLEMInstalled a bank of 19 of them in 2004. Now, six years later, I'm replacing them as they expire. Six years of top-rated performance, 24/7/365. And when they were called to the bat, they were there for me. Yes, I'd definitely recommend these APC batteries to any IT Dept looking for a reliable power backup.