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...atteries then the new ones go back & I'll lean on the store for a load test. I'm guilty of not questioning my assumption that the new batteries were good! I'd say that expecting "new" ( as in recently purchased ) products to be in perfect shape ( unless ebay or made from chinesium, that is ) is a fair assumption. Practice teaches us that not all fair assumptions are also true :) Now, in the event that the UPS will refuse to come up even with the old batteries, I suggest a careful inspection of the electronic board, of the cables and especially of capacitors and places w...

My personal experience with a number of UPSes that are monitored via USB cable is that communications errors such as the ones referenced in the issue you linked to below are a result of USB hardware incompatibilities between the USB chipset and the USB port on the motherboard.*? This is NOT specific to the NUT project as it affects both apcupsd and in fact, has been reported as an issue with