Before you can replace the battery, you must have a small Phillips screwdriver, a small flat screwdriver, and a CR2032 lithium coin-cell battery.
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Using a Phillips screwdriver, remove the three screws from the back plate .
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Remove the back plate from the remote.
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Wrap the end of a small flat screwdriver with tape.
The tape protects the battery, battery compartment, and contacts from damage.
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Carefully pry the battery from the back plate.
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Install the new battery into the back plate with the positive side facing down.
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Verify the gasket is fully seated in the groove.
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Replace the backplate, aligning the post with the gap in the circuit board .
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Replace and tighten the three screws.
NOTE:
Do not overtighten.