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Replacement Car Key Fobs Fobs that perform a wider range of functions or are part of sophisticated vehicle-security systems can be more costly to replace and require special equipment generally only accessible at dealerships. However, replacing the coin-shaped battery typically costs around $10 or as. You can buy a new one at hardware stores or big-box retailers. Keyless Entry Key fobs are used to unlock and start cars. Key fobs usually include batteries and a tiny transponder that commu