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How to Repair a Remote Key Although most remote key fobs are equipped with amazing battery lives, they will eventually wear out. Sometimes it's as simple as replacing the batteries, but occasionally there are more serious issues. Remove the remote from the unit and clean the buttons. Then, flex them in and out. These techniques may be all that you need to get your key fob back in working order. Battery If the fob continues to functioning, you can swap out the CR2025 or CR2032 battery. I