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Key Fob Repair: Replacing the Battery The buttons on key fobs may get damaged and stop working properly after being tossed around in pockets and purses. This problem can be fixed by replacing the battery that is usually found in the snap-out cases of the majority of car fobs. But, a new one may not revive your key fob if the switch's internal contacts are worn out. This is a straightforward fix you can perform at home. Replace the Battery If