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Key Fob Repair: Replacing the Battery Being tossed around in purses and pockets key fob buttons may be damaged and not register presses reliably. Replacing the battery, which a majority of car fobs are equipped with in a snap-out case may fix the issue. If the contacts on your key fob have damaged, a replacement might not be enough to revive it. This is a simple fix that you can perform at home. Replace the battery It may be time to change the battery if your key fob isn't working properly or takes longer to unl