HowDoI - Nest Thermostat Battery Sensor

[proper whale]

For context, apparently the way my HVAC system is wired my nest thermostat only gets power while it's actually turning something on, and so if it's a nice day outside and my system never has to turn on sometimes the thermostats internal battery will die.

Well, I just got home today and apparently the weather outside has been nice enough that my thermostat hadn't needed to kick on at all today I now have come home to a dead thermostat that I have to pull off the wall and charge manually. I would like it if home assistant could know the battery was about dead and do something to prevent the thing from just dying like kicking the fan on or something.

[long cloud]

If you are having this problem because you lack a c wire a far better solution would be to put one of these in your HVAC system https://store.google.com/product/nest_power_connector?hl=en-US