The Corentium Home comes with 3 x AAA batteries and is expected to have a battery life of approx. 1.5 - 2 years.
Wave Radon and Wave Plus come with 2 x AA batteries and they are designed to have an expected battery life of approx. 1 year.
The Wave Mini comes with 3 x AA batteries and they typically have a lifetime of approx. 1.5 years. When the batteries die, simply replace them with good alkaline batteries and keep monitoring!
If monitors are Hub-connected and therefore using SmartLink instead of Bluetooth connectivity, they will have an extended battery lifetime, as SmartLink uses less power than Bluetooth.
Unless it is operated in an unconventional way, our Airthings Wave has an expected lifetime of many years, just like a normal smoke or CO detector.