Open thermostat with empty battery.
It would be very helpful if there was an option in the app to leave the thermostats open (perhaps with a choice of 0-100%) when they run out of power. I currently have three thermostats, one of which constantly reports that it's out of power even when it's not, and this one also runs out of power much faster, requiring a battery change every 1-2 months. I live in a cold climate, and when the thermostat runs out of power, it completely shuts off the radiator. This would be problematic if I'm on vacation and don't notice it. Therefore, it would be great if you could choose to leave the thermostat open to avoid frost damage, etc.