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The 2007 Nissan Maxima key fob uses a CR2025 3-volt coin cell battery, which is commonly found in watches and other electronics. These batteries are affordable, typically costing between $5 to $10 depending on the brand and quantity. If your key fob is not working, the first thing to check is the battery. When the battery is low, the car will alert you to replace it. If a new battery doesn't fix the issue, then the problem may lie with the damaged key transponder, which can be taken to the dealership for repair.
The key fob for a 2007 Nissan Maxima operates with a CR2025 3V battery.