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If you connect it up to a Windows computer with the supplied (goofy-looking) USB cable and install the APC Monitor progam "Powerchute" available on the APC web site, you can set all the activity levels and tell it just when to beep the beeper, or turn it off completely. I have two of these in my house, and have set them to never beep. The cable is goofy because it is USB on one end and a network-type on the other end. Software Firmware
After about 2 to 3 years the batteries usually have to be replaced. I found with our UPS's we get about 3 years maximum from the batteries. Ordering the originals from APC is rather expensive.
Locate a professional battery distributor in your area. Get the part numbers written on the batteries in your UPS, and including the detailed descriptions. You can then order these from the distributor. APC uses industry standard batteries. We found the Panasonic and Portilac brands to be excellent.
APC manufactures the UPS's. They use various battery manufactures depending on bid costing.
Try installing the software that is included with the unit. If you didn't get the software, I believe you can download it for free from APC's website. The software will typically give you the status of the batteries and let you know if you need to replace them. If you can't get the software, take the batteries out (keep note of the wiring configuration) and test each battery using a DC voltmeter. The batteries should read around 13.5 volts DC. If they are around or below 11.5v DC, it's time for new batteries. This model, if its the black 110v version, requires the RBC32 which can be found at: http://www.batteryinternational.com/apc-rbc32--f2.html
It sounds like you may need a new battery. The batteries are continuously tested by the UPS and it could be that the voltage is passing one test, and failing the next which is resulting in the light flashing. You can test the battery with a voltmeter. It should read over 11.5 volts, if not you need a new battery set. You can get batteries from http://www.batteryinternational.com/ups-batteries-apc-batteries.html
This is a signal that the battery is dying, and is failing the self-test. According to Conext, the battery replacement alarm goes off for one minute every five hours. You should also see the replace battery light on the front of the unit lit. Changing the battery should solve your problem.