Yes, the Nest Thermostat E features a built-in, rechargeable lithium-ion backup battery located inside the display unit. This internal battery stores electrical energy to keep the microprocessor running, maintain Wi-Fi connectivity, and preserve user settings during brief power interruptions or when HVAC relays are inactive. Under normal conditions, it charges automatically from the low-voltage 24V wires connected to your heating and cooling system. Verification: Check the battery voltage status in your thermostat settings menu to ensure it maintains a healthy charge above 3.7 volts.
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