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Car Key Battery Replacement If your car key fob doesn't work it could be due to a low or dead battery. Replacing the battery in your car key fob is actually quite simple, and can be accomplished within a couple of minutes at home. Find out what kind of battery you need. A lot of them are CR2025 or 3-Volt batteries that can be purchased at hardware stores as well as some electronic retailers. Open the car key If you're like most people you have a car that is a major part of your life. You need it to get to work, get to s