BE750G-CN says battery disconnected even with new batteries attached

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The other day my BE750G-CN suddenly started beeping and throwing an error as if it needed a new battery. I dutifully replaced the battery but the battery error light with constant tone keeps coming on. I have tried multiple batteries, to no avail.

Powerchute tells me that the battery is diconnected. although i have checked and rechecked it.

Is there a way to tell if it is a UPS failure?

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