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Key Fob Repair - Replace the Battery Key fobs last between three and four years. If they begin to show signs that they are damaged, you should examine them to check for damage and replace the battery if necessary. Fortunately, many car makers make use of coin-shaped batteries, which are sold at grocery stores, pharmacies, and hardware stores. You can also find videos online from users who explain how to replace the key fob battery. Reduced Operational Range It's most likely that the battery is