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Key Fob Repair: Replacing the Battery Getting jostled around in pockets and purses, key fob buttons can be damaged and not register presses with accuracy. Replacing the small battery, which a majority of car fobs are equipped with in a snap-out bag, can fix this problem. If the contacts in the key fob are damaged, a new replacement might not be enough to revive it. There's an easy fix that you can try at home: Replace the battery It may be time to replace the battery in your key fob if it is slow o