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Key Fob Repair - Replace the Battery Key fobs last between three and four years. If they begin to exhibit signs of being damaged, you should inspect them to check for damage and replace the battery, if needed. Many car manufacturers use a coin-shaped battery that can be found in grocery stores, pharmacies and hardware stores. You can also find videos online from people who have a guide on how to replace the battery on the key fob. Reduced Operational range When a key fob starts to work less