Introduction
Replacing the battery on your Nest couldn't be easier. The only tools required are tweezers, a Phillips #0 screwdriver, Phillips #2 screwdriver, and the opening tool
Tools
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Grasp the display's outer ring with your fingers and pull directly away while rotating clockwise to remove the thermostat from the wall.
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Go to the electrical panel and turn off the circuit to make sure no power is running to the thermostat.
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Once the power is off, disconnect the Y1, G, R, W1, C, and OB wires.
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Remove the two 1 ¼” drywall screws holding the base display and base plate in the wall using a Phillips #2 screwdriver.
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Remove the base plate and base display.
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Grab the pin connector and gently pull up to remove the thermostat backplate from the thermostat.
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Grasp the orange tab with tweezers and gently pull the ribbon cable directly away from the motherboard.
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Disconnect the battery connection identifiable by the black, yellow, and red wire.
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Pull down the two pull tabs on the battery.
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Grasp the battery with your fingers.
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Pull gently directly away from the display to unplug the battery from the display motherboard.
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To reassemble your device, follow these instructions in reverse order.