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Key Fob Repair: Replacing the Battery When they are tossed around in purses and pockets, key fob buttons can be damaged and not register presses accurately. Replacing the small battery, which most car fobs come with in a snap-out case can sometimes fix this problem. If the contacts inside your key fob are damaged, a replacement may not be sufficient to make it work again. This is a straightforward fix you can perform at home. Replace the Battery If your key fob is feeling slow or takes longer than usual to unlock o