APC BackUPS ES 650 Beeps 3 times at startup but works fine

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I am using a BackUPS ES 650 in my TV stack, to backup a couple of sources (AppleTV, Roku, Blu Ray Player, Amp, but not the TV itself). In general, very low load.

Whenever I turn on the stack, my UPS beeps 3 times, and then functions normally. The green power light flashes with the beep, and I get no ‘replace battery’ indicator. This has just started in the last couple of weeks.

I can’t find anything in the documentation or online as to what 3 beeps at startup means if it never repeats. Any ideas?

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