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Car Key Battery Replacement If your car key fob doesn't work it could be due to a weak or dead battery. Replacing the battery in your car key fob is actually very simple, and can be accomplished within a couple of minutes at home. Determine which type of battery you need. Many are CR2025 or CR2032 3-Volt batteries, which are available at hardware stores and some electronics retailers. Open the car key If you're like the majority of people you have a car that is a significant part of your life. It's essential for school, work and for running errands.