I reiterate what other customers have said. A thermostat should not be limited by its battery life, lasting only 10 years at the most. I tried replacing the battery but this is not an easy job for a novice. Rightly or wrongly, I have now had to buy another learning thermostat, which will I hope last another 10 years at least. Why have Nest not recognised this issue and redesigned the unit for easy battery replacement. Thereby enabling a longer life span.
