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Replacement Car Key Fobs Replacement of fobs that are more complicated or are part of more sophisticated security systems for cars can be expensive and require special equipment, which is typically only available in dealerships. But replacing the coin-shaped batteries typically costs around $10 or as. You can buy the new battery at hardware stores or big-box retailers. Keyless Entry Key fobs are used to unlock and start cars. The fob typically has batteries and a tiny transponder which communicates with the car's computer to verify the owner. This can deter theft s