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Key Fob Replacement For Car Batteries Key fobs let you lock and unlock the doors of your vehicle without having to use keys made of metal. Some come with buttons to activate the trunk or alarm and some even start your car. But these handy devices can run into difficulties. Replacing them is more expensive than cutting a traditional key. Battery The key fob is equipped with a battery to power the electronic. A dead battery could stop the key fob from unl