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How to Repair a Remote Key Although most remote key fobs boast impressive battery life, they do eventually wear out. Sometimes it's simple to replace the batteries inside the device, but in other cases the problem can be more serious. A quick fix that can help is dismantling the remote and cleaning the buttons before moving them in and out. These methods could be all you require to get your key fob back in working order. Battery Car key remotes use CR2025 or CR2032 batteries and they can