Batteries are running low quickly


I’ve got 2 Tado Smart Radiator Thermostats installed for about 2/3 months now. One of the radiator thermostats gave a low battery e-mail on Tuesday, I’ve changed the batteries with new LR06 batteries and now today I’ve got an new notification saying the batteries are empty again… The other radiator thermostat is still working fine.

Is this normal? Any tips?

Also I think I should state that the radiator thermostats are in the same room. It’s a big room though, there is 8 meters between the bridge and the malfunctioning radiator thermostat.