What if battery on water sensor completely dies?

I get battery low alerts on my sensors periodically showing 1%. But then they go right back up to normal. The question is: if a battery died completely, would ST know? Or would lack of communication from, say, a water sensor, not cause any notifications? I’m worried that if a water sensor battery does die, ST won’t know to notify me. Is there a definitive way to know what ST would do in that case?

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You are most likely correct, that you will never know.

There is a SmartApp Simple Device Viewer that you can set alerts if a device goes unresponsive for a period of time.

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From Wellness Check, see any of: