You can change a Nissan key fob battery yourself in about two minutes
A Nissan key fob battery typically lasts three to four years before it stops holding a charge. When your fob stops locking or unlocking the car from a distance, a dead battery is almost always the cause. The good news: you do not need a dealer visit or special tools. You can open the fob, swap out the old battery for a new one, and be done before you finish your coffee.
The battery type varies slightly by Nissan model year and fob design, but the process is nearly identical across all of them. Most Nissan fobs use a CR2032 battery, which costs two to five dollars at any pharmacy, grocery store, or hardware store. A few older models use CR2025 or CR2016 instead, but you can confirm which one you need by looking at the battery compartment once you open the fob.
Key Takeaways
- Most Nissan key fobs use a CR2032 battery that you can buy at any drugstore for a few dollars.
- You open the fob by sliding a flat tool into the seam between the two halves and gently twisting to separate them.
- The battery sits in a metal holder; note which side faces up before you remove it, then insert the new battery the same way.
- Snap the fob back together and test the lock and unlock buttons before you put it away.
What you need to open the fob
Gather a flat tool and a replacement battery before you start. A coin works fine—a dime or penny gives you enough leverage without being so thick that you risk cracking the plastic. A flathead screwdriver, butter knife, or plastic spoon also works. You do not need anything sharp or powered.
Buy your replacement battery before you open the fob so you have it ready. CR2032 is the standard; check the battery compartment once you crack the fob open to confirm. If you see a different number printed on the old battery, buy that type instead. Most stores stock CR2032 in the pharmacy or electronics section, and they cost between two and five dollars.
How to open the Nissan key fob
Look for the seam that runs around the edge of the fob where the two plastic halves meet. Slide your flat tool (coin, screwdriver, or knife) into that seam on one of the narrow sides of the fob. Gently twist the tool to create a small gap between the halves, as if you were opening a clamshell.
Once you have a gap, work your way around the edge with the tool, twisting gently at each point until the two halves separate. Do not force it—if you meet resistance, stop and try a different spot on the seam. The halves will come apart cleanly once you have loosened them enough. Set one half aside on a clean surface so you do not lose any small parts.
Remove the old battery and install the new one
Inside the fob you will see a small metal holder or clip that holds the battery in place. The battery sits flat in this holder with one side facing up. Before you remove the old battery, take a mental note of which side is facing you—the side with the plus sign or the side with the minus sign. This matters because the new battery must go in the same way.
Gently pry the old battery out of the holder using your fingernail or the edge of your flat tool. Do not use force; it should come free with light pressure. Drop the old battery aside—do not throw it away yet, because if the fob still does not work after you install the new battery, you may need to check that you inserted it correctly.
Slide the new battery into the holder with the same side facing up as the old one was. The battery should sit flat and snug in the holder. If it feels loose or does not sit flush, remove it and flip it over—you may have inserted it backwards. Once it is seated properly, you are ready to close the fob.
Close the fob and test it
Line up the two halves of the fob and press them together firmly until you hear or feel a click. Start at one end and work your way around the edge, pressing down as you go, to make sure the seam closes evenly all the way around. The fob should feel solid and not have any gaps or loose edges.
Test the lock and unlock buttons right away. Stand near your car and press the lock button; you should hear the doors lock and see the lights flash. Press unlock and listen for the unlock sound. If both buttons work, the battery is installed correctly and you are done. If nothing happens, open the fob again and check that the battery is seated properly and facing the right direction.
What to do if the fob still does not work
If you installed a new battery and the fob still does not respond, the battery may be inserted backwards. Open the fob again and flip the battery 180 degrees so the opposite side faces up. Close the fob and test again.
If flipping the battery does not fix it, the problem may not be the battery. The fob's internal circuit board or buttons could be damaged, or the car's receiver may have lost its pairing with the fob. In that case, a Nissan dealer can reprogram the fob or replace it if the internal parts are faulty. This is not something you can fix at home, but it is also not common—a dead battery solves the problem in the vast majority of cases.
Frequently Asked Questions
Can I use a different battery type if I cannot find CR2032?
No. CR2032, CR2025, and CR2016 are not interchangeable—they have different thicknesses and voltages. Using the wrong type can damage the fob's circuit board or cause it to malfunction. Check the old battery or the compartment to see which type you need, then buy that exact type.
How long does a new battery last in a Nissan key fob?
Most CR2032 batteries last three to four years in a key fob, depending on how often you use the buttons. Heavy use shortens the life; light use extends it. You will know it is time to replace it when the fob stops working from your usual distance from the car.
Do I need to reprogram the fob after changing the battery?
No. Changing the battery does not erase the fob's programming. Once you install the new battery and close the fob, it should work when ready without any reprogramming steps.
What if I drop the battery or lose a small part when I open the fob?
If you lose the battery, buy a new one—they cost a few dollars. If you lose a small plastic piece or spring from inside the fob, take the fob to a Nissan dealer. They can replace the internal parts or give you a new fob if the damage is too severe to repair.
Is it safe to handle the battery with my bare hands?
Yes. CR2032 batteries are safe to touch. Wash your hands afterward if you prefer, but there is no risk from brief contact. Do not swallow the battery or expose it to extreme heat, and keep it away from children and pets.