A week ago I got the following error on my APC Smart-UPS 1000 which I muted.
Warning State: Connect battery Load: 55% Batt: 100%
Today, I could smell a sort of sulfur/sulphur/rotten egg smell when I came into the office and the UPS is alarming again. There isn't a burning smell.
I have vented the office & server room and shutdown the UPS.
Got any other advice?