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Replacement Car Key Fobs Fobs that can perform a greater range of functions or are part of advanced security systems for vehicles can be more expensive to replace and require special equipment generally only available through dealerships. However, replacing the coin-shaped battery typically costs just $10 or more. You can get an alternative battery at hardware stores or big-box retailers. Keyless Entry Key fobs are used to unlock and start automobiles. Key fobs usually come with a battery,