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How to Repair a Remote Key Although many remote key fobs boast amazing battery lifespan, they eventually wear out. Sometimes it's as simple as replacing the batteries in the device but sometimes the problem can be more serious. A quick fix that can help is dismantling the remote, cleaning the buttons and flexing them in and out. These methods could be all you need to get your key fob to work. Battery Car key remotes use CR2025 or CR2032 batteries, and they can often be swapped out