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Key Fob Repair: Replacing the Battery Being tossed around in pockets and purses keys fobs can get damaged and stop registering presses reliably. Replacing the small battery, which the majority of car fobs come with in a snap-out case can fix this issue. However, a new replacement may not revive your key fob if the internal switch contacts are worn out. This is a simple fix that you can do at home. Replace the Battery If your key fob seems slow or takes longer than usual to unlock or lock your car, it may be