“Does the whole unit need to be replaced when the non-replaceable 3V battery dies? Insert on box says: "Thermostat contains a non-replaceable 3V battery. Sensor, if included, contains a replaceable 3V batter (type CR2477).”

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• The non-replaceable 3V battery in the thermostat is a backup battery used to maintain settings or time during power loss. It’s not needed for normal operation when the thermostat is wired and powered through your HVAC system (via the C-wire or Power Extender Kit). So yes, you do not need to replace the whole unit when that battery dies, because the thermostat continues to function normally as long as it's connected to power.

  Answered by ecobee 9 months ago

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• You should probably listen to their advice.

  Answered by user347331 8 months ago

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