“How often do you have to change the battery if ever and if it doesn't need a battery what size”

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• Hey there. The Nest Thermostat receives power from your HVAC system. It also uses 2 AAA alkaline batteries as a backup, or to supplement if your system can’t deliver enough power. Check out this link for more information: https://support.google.com/googlenest/answer/9297548

  Answered by Google Team 1 month ago

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