I have an APC Smart 750 UPSand the Replace battery light has been intermittently coming on with an audible alarm. I power cycled it and the alarm light went off and it was OK for a couple of weeks. But the alarm has come back on again....beeps for about 10 seconds then goes out. Few minutes later, comes back on again.
Two 12v batteries connected in series. One reads 13.06 v and the other 13.07.
Not sure what tests I can do.