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Key Fob Repair - Replace the Battery Key fobs are typically used for three to four years. If they begin to display signs of being damaged, you should examine them to check for damage and replace the battery, if needed. A lot of car manufacturers use a coin-shaped battery that can be found in supermarkets, pharmacies, and hardware stores. You can also find online videos of users who explain how to replace the key fob battery. Reduced Operational range It's most likely that the battery is dead when a