Well - the first one was due to a scheduled Road-Work where I was advised that the power would be disable for 4 hours. What I did not predict though was that the UPS that was running here for some years now wouldn't last for more than 3 Minutes making me order a new one - which I have installed today. And this means, another outage. The new UPS though has a display showing the power-state and details on the battery, and hopefully I will be able, in the future, to predict when the battery has to be replaced.
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