Yes, depending on the specific model, many Emerson Sensi thermostats utilize internal or removable backup batteries (such as AA alkaline cells or rechargeable lithium-ion cells) to preserve user settings, maintain clock memory, and provide temporary power during brief low-voltage interruptions. However, under normal operating conditions with a proper C-wire connected, the thermostat draws continuous 24V power directly from your HVAC system. Verification: Check the battery compartment behind the faceplate or review battery voltage metrics in the app settings menu.
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