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This was originally posted on APC forums on 12/22/2013
My APC Back-UPS XS 800 keeps switching from online to on battery every few minutes/seconds. I put a new
battery in it 9 months ago and it just started this a few days ago. It doesn't say replace battery so I don't know
what's wrong with it. I have had it for over 5 years now. I have several apc units and they are not doing this. So
I assume the electric utility power comming in is OK. Thanks, Dudley
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