How old is your UPS? Even though it's probably under maintenance we find out that you should really replace all the batteries every 3 years or so. Doing them as they fail may be under maintenance may be a solution but is highly disruptive versus changing them all at once. Just had one battery fail. Sign they are getting long in the tooth. However we're abandoning this building in a few months. I get the kickback on taking the used batteries to recycling.
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