I have one of the FineOffset clones from Conrad.
Running it for 1.5 or 2 years, harsh weather range from -20 Celsius to +40 Celsius during that time. I have installed it and it is still running on the initial batteries. 2 pieces of Varta AA professional lithium non-rechargable batteries (as I remember AA, but it can be it needs AAA, I order those together and one for the outside unit the other for the inside display Wifi unit).
I set it up together with a WeeWX installation on a RaspberryPi Zero W and it stores the data locally as well.