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Key Fob Repair: Replacing the Battery The buttons on key fobs could get damaged and stop functioning properly after being tossed around in purses and pockets. This issue can be resolved by replacing the small battery that is usually located in the snap-out case that comes with most car fobs. If the contacts in your key fob are worn, a new replacement might not be enough to bring it back to life. This is a simple fix you can perform at home. Replace the Battery If your key fob seems sluggish