BackUPS 800 Constant switching

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I have a BackUps 800 that constantly switches between mains power and battery, I have changed the batteries without success. I know its not the mains power as I have another APC UPS on a separate PC that is completely stable. Looking at Powerchute the UPS seems to be seeing fluctuating input voltage I have also seen the voltage reading as a set of completely ridiculous numbers. The other PC and UPS are showing a stable supply of between 238 and 242v. Anybody got any ideas other than throw it in the bin?

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