Once again I seem to be asking about older UPS units. In this case we have some divisions who have put off battery replacements for a couple of years. That is to say, the maintenance tech visited the sites, found the batteries to be more than 5 -7 years old, recommended replacement each of the past two years, and now we have a tight budget year which is their excuse for not purchasing new batteries this year. The units are all ferro-resonant UPS units up to 12 years old. We had one unit fail earlier this year due to a thermal issue with the batteries. My question, to finally get to the point, is: Is there a physical danger to continually charging and using the old batteries?
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