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Key Fob Repair: Replacing the Battery The buttons on key fobs may be damaged and stop working after being tossed around in pockets and purses. Replacing the small battery, which a majority of car fobs come with in a snap-out case may fix the issue. But, a new one could not be able to revive your key fob if the switch's internal contacts are worn out. This is a simple fix you can do at home. Replace the battery If your key fob feels slow or takes longer than normal to unlock or lock your car, it might be ti