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Key Fob Replacement For Car Batteries Key fobs let you lock and unlock your car's doors without the use of a metal key. Certain key fobs come with buttons that can activate the trunk alarm or trunk, while others can start your vehicle. But these handy devices can run into problems. Replacing them is more expensive than cutting the traditional key. Battery The key fob is equipped with batteries that power the electronic components inside. A dead battery can stop your key fob from unloc