Is there a Zigbee mains and battery device like the ring extender

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Does anyone know of a Zigbee mains and battery device that can work like the Ring extender, to determine when there is a power failure. Trying to go with Zigbee only on this particular hub, but it's not looking good.

Thanks!

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My Honeywell Zwave T6 thermostats use the C-wire or batteries, and the community driver has a status attribute for how it being powered. If the power goes out, it updates to using battery instead of mains. So that generates an event when the power goes out I can use.

So maybe a Zigbee Thermostat that can run from a C-wire, but also has a battery backup, and a driver for it that supplies the powered state.

Otherwise, I guess you could poll any mains Zigbee device periodically to check if it is still online.

Edit: Another idea, use a Zigbee leak sensor with a probe as a dry contact sensor, and just connect it to a 120v dry contact relay that opens when the power goes out. Any 120v relay would do, that closes when it gets 120v.

Something like this, with 120v from the wall for power, and the leak sensor between Com and either Normally Closed or Normally Open. Which one you use would depend on how you want the sensor to read in Hubitat when the power goes out, either closed or open.

I recently bought a bunch of the Tuya Zigbee leak sensors with a probe from AliExpess for under $5 that work great as dry contact sensors.

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Thanks for the reply!

This sounds like an option.