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Car Key Battery Replacement When your car key fob doesn't work, it could be due to a weak or dead battery. Replacing a car key fob battery is actually very simple, and can be done within a couple of minutes at home. Determine which type of battery you need. Most are 3 Volt or CR2025 batteries that can be found in hardware stores and electronics retailers. Open the car key If you're like the majority of people, your vehicle is an integral aspect of you