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Key Fob Repair - Replace the Battery Key fobs last between three and four years. When they begin to show signs of wear it's a good idea to check for damage and consider a replacement battery. Fortunately, a lot of car makers utilize coin-shaped batteries that are available at grocery stores, pharmacies and hardware stores. You can also find online videos of users who show how to replace the key fob battery. Reduced Operational range If a key fob begins to fail it's because the battery has failed. There are a variety of batteries