UPS ES 750 occasional beep

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I have a UPS ES 750 (model BE750G) that beeps occasionally. I hear a 1-2s beep, then nothing for an hour or two. Then it may beep again. Power light stays green as far as I can tell. (I'm not fast enough to run to it to see if the light changes while it beeps for the 1-2 seconds.)

Connected to the unit:

in Battery Backup: large screen smart TV, Xbox Series X, Amazon fire stick

in Surge protection: sound bar, Amazon echo dot, small alarm clock

No computer connected to it.

It's not doing any of the troubleshooting patterns in the manual so I don't think it's the battery.

Maybe an intermittent power draw change? Appreciate any thoughts or suggestions.

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UPS ES 750 occasional beep

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