So, how long does the Nest Thermostat’s battery last? The Google Nest Thermostat uses a lithium ion battery. This battery type has an average lifespan of 300-500 full charges, or 2-3 years of regular use.
We’ve provided detailed instructions for checking your Thermostat’s battery life below: Select Battery Level. The device screen will now display the current charge. Checking the battery level with the Google Home app is a great and quick way to get the job done. Select Battery State.
Your Nest Thermostat’s battery is non-removable and cannot be changed. This means that the life of your battery directly determines the lifespan of your device. Your Nest thermostat comes with a two-year warranty, which allows for a replacement should the battery malfunction or fail to hold a charge within that time period.
Since then we have never had a long battery life with either the TRV or thermostats batteries as compared with another manufacturers system (of an earlier vintage without internet control, which is installed in my house in the UK). Typically the batteries in either the TRV or 'stat units last <4 months & often about 2 months.
This can be done directly on the Nest Thermostat, and checking the unit routinely can help you keep track of the average amount of time your Thermostat will require charging. If this amount of time shortens significantly, your thermostat’s battery may be reaching the end of its lifespan.
Duracell quote -20C as the minimum temperature but that drops as the battery is used. Also at 0C batteries are have 20% less energy than a warmer battery. For use in cold climates, Lithium batteries are best. They are more expensive but generally, Lithium will last longer and have good cold performance, down to -28C.