Following up on this: seems that the battery of this UPS is no longer working, i.e. if I interrupt the power supply it doesn't keep the power arriving to my equipment (Bought this new a year ago, wander how long it was on a shelf?) So, it looks like the driver in a strange contorted way is doing its job - it should read OL, but as the UPS battery is no longer any good it reads OB BL and shuts the system down. Halfway between a bug and a feature, I guess. Michele
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