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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 worn, you should inspect them for damage and replace the battery, if needed. Fortunately, a lot of car makers make use of coin-shaped batteries, which can be purchased at grocery stores, pharmacies, and hardware stores. You can also find videos online from users who show how to replace the key fob battery. Reduced Operational range If a key-fob starts to malfunction less