I use the following SmartApp to let me know if any of my devices stop reporting in for any reason. As you mention, battery monitoring is not foolproof since the device can die well above the threshold for notification.
2017-06-08 - Update: Added support for new Ask Alexa features: Message Queue, message expiration, and message overwriting.
2017-03-11 - Update: Added the ability to be notified if your Hub goes offline / online.
2017-03-08 - Update: Added support for SmartThings “Health Check” capability. If the device supports it, Device Monitor will look at the online/offline status of the device. This can be more accurate than looking at events sent by the device.
2016-09-06 - Update: Added support for Ask Alexa .
2016-08-22 - Update: I have made a few changes. I am using a more accurate event detection, battery levels can be checked, and you can be notified when devices come back online. Check post 63 for more info.
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This app checks the selected devices to determine if they are communicatin…
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