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- Replace the Battery Key fobs typically last 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 from users explaining how to replace the battery in a key fob on your own. Reduced Operational Range It's most likely that the battery is dead when the key fob