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Key Fob Repair: Replacing the Battery Being tossed around in purses and pockets key fob buttons may get damaged and stop registering presses reliably. Replacing the battery, which the majority of car fobs come with in a snap-out bag, can fix this problem. But, a new one is not likely to restore your key fob if the internal switch contacts are worn out. This is a simple fix you can perform at home. Replace the battery It's possible to replace the battery if your key fob is slow or takes longer to unlock or lock