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Replacement Car Key Battery For Your Nissan Qashqai Imagine trying to start your Nissan in Dearborn to drive to work or do errands in Troy and nothing happens. If the key fob has stopped responding, it could require replacement batteries. To replace the battery on the key fob simply flip it over and press a small release latch. Remove the old CR2025 and note its location. Replace it with a new CR2025. How to Replace the Battery on Your Key Fob A dead key fob battery