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Replacement Car Key Battery For Your Nissan Qashqai Imagine trying to start your Nissan in Dearborn to drive to the office or to run errands in Troy, but nothing happens. If the key fob stops responding, it could require an upgrade battery. To replace the battery in the key fob turn it upside down and push the small latch. Take out the old CR2025 and note its location. Replace it with a new CR2025. How to Replace Your Key Fob Battery