Replacement of Batteries
I've just replaced the batteries on my Tado after just over a year. I suggest that the diagram showing how to remove the unit from the base includes a reference to the need to remove a tiny slot head screw located under the unit and therefore difficult to see, and holding the Tado onto the base plate. Replacing the screw is not easy as its being done upside down! My solution was to put a bit of "Blu-tac" to hold the screw on the screwdriver which worked a treat.