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Key Fob Repair: Replacing the Battery The buttons on key fobs could be damaged and stop working after being tossed around in purses and pockets. This problem can be fixed by replacing the battery that is usually found in the snap-out case that comes with the majority of car fobs. If the contacts on your key fob have damaged, a replacement may not be enough to revive it. This is a simple fix you can perform at home. Replace the battery If your key fob is feeling slow or takes longer than usual to unlock or lock your vehicle