Member level 1
hello there, I am working in one of the company here in the phil. they have this APC ES 500 UPS and when it is turned on after 5 seconds it will keep on beeping. I've tried to disconnect the battery and tested it via multitester and it still has around 12 V on it. I mounted the battery again, connect it to the outlet, turned in on, tested the outputs of the UPS and it works fine. The only thing that is abnormal is it keeps on beeping after 5 sec. after it has turned on.....HELP please!