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Key Fob Repair: Replacing the Battery The buttons on key fobs could get damaged and stop functioning properly after being jostled in pockets and purses. Replacing the small battery, which the majority of car fobs are equipped with in a snap-out bag, can fix this problem. But, a new one may not revive your key fob if the switch's internal contacts are worn out. This is a simple fix you can perform at home. Replace the Battery It may be time to change the battery if your key fob is slow or takes longer t