Solutions
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IwishIcanFLighT's post in NUT - UPS Alarm : Battery voltage too low was marked as the answerI just installed the replacement battery and the alert went away at reboot. Thanks for your help!
One thing that I would add though: I would prefer to receive an email/push notification for such an important alert (low battery voltage)rather than discovering it after an unclean shutdown. The current alert message is easy to miss in the Unraid dashboard, and I don't even connect to the dashboard every day. Is there a way to configure this as an email/push alert?