Hi, I'm using Eaton UPS 9130. I have 18 units installed from 6 months to a year, located in different cites around Philippines. 5 of them suddenly went off and would not restart ( no power, no display, no previous alarm). Also using MBP's and these work fine. I had checked one battery pack and the voltage is at 82Vdc, which i think is still good. I have one more spare unit and tried to swap the battery pack from the defective unit. Results: the spare unit still worked while the defective still didn't work. What is the problem then?
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