There are several Nest products. I didn't replace the batteries in the 4 years I was using it.
New Google Nest Smart Thermostat E
Google Nest Learning Thermostat 3rd Generation, Stainless Steel - Smart Thermostat - A Brighter Way To Save Energy
Google Nest Learning Thermostat 3rd Generation Smart Thermostat Black
Google Nest Learning Thermostat 3rd Generation Smart Thermostat Copper T3031EX
Google Nest Learning Thermostat (3rd Generation) Smart Thermostat (T3028GB)
