You can replace a Nissan key fob battery yourself in about five minutes with no tools
Most Nissan key fobs use a coin-cell battery—usually a CR2032 or CR2025—that you can swap out at home without taking the fob apart or visiting a dealer. The battery typically lasts three to four years depending on how often you use the fob. When your fob stops locking or unlocking your car from a distance, a dead battery is usually the first thing to check.
You will need a replacement battery (available at any drugstore, supermarket, or hardware store for a few dollars) and nothing else. The fob itself has a small slot or seam that lets you open it by hand or with a coin.
Key Takeaways
- Nissan key fobs use CR2032 or CR2025 coin-cell batteries that you can buy at any pharmacy or grocery store for under five dollars.
- You open the fob by sliding a coin into the seam on the side or back, then gently prying the two halves apart—no screwdrivers needed.
- The battery sits in a metal holder and slides out sideways; note which side faces up before you remove it so you can install the new one the same way.
- After you insert the new battery, snap the fob back together and test the lock and unlock buttons from a few feet away from your car.
- If the fob still does not work after a new battery, the problem is likely a worn button contact or internal damage, not the battery itself.
Finding the seam and opening your fob
Look at the edge of your key fob for a thin line or slot running along one side. This is the seam where the two plastic halves meet. On most Nissan fobs, this seam runs vertically down the side or horizontally across the back. Slide a coin—a dime or penny works well—into the seam and gently twist it like you are opening a paint can. Do not force it; the halves should separate with light pressure.
Once you feel the fob start to give, work the coin around the seam to loosen both sides evenly. You should be able to pull the two halves apart by hand after a few seconds of gentle prying. If the seam is very tight, try a flathead screwdriver instead of a coin, but keep the pressure light to avoid cracking the plastic.
Locating and removing the old battery
Inside the fob, you will see a small metal holder or clip holding a round, flat battery. The battery is usually silver-colored and about the size of a dime. Before you touch it, note which side is facing up—the positive side (marked with a + symbol) or the negative side (marked with a − symbol). This matters because the battery will only work if it is installed the correct way.
Slide the battery out of its holder sideways. If it is stuck, use a fingernail or the edge of a coin to gently pry it out. Do not use a sharp tool that could damage the metal contacts inside the holder.
Installing the new battery
Take your new CR2032 or CR2025 battery and check the package to confirm it is the right type for your fob. Slide the new battery into the holder with the same side facing up as the old one was. The battery should sit flat and click into place. If it does not sit flush, you may have the polarity reversed—flip it over and try again.
Once the battery is seated, you should hear or feel a small click. The battery holder will grip the edges of the battery and hold it in place.
Closing the fob and testing it
Align the two halves of the fob so the seam lines up evenly. Press them together firmly until they snap shut. You may hear a small click when they lock back into place. Do not force them; if they do not want to close, check that the battery is sitting flat and not blocking the seam.
Step outside and stand a few feet away from your car. Press the lock button on the fob and listen for the car to lock. Press the unlock button and listen for the car to unlock. If both buttons work, the battery replacement is complete. If only one button works or neither works, try pressing each button several times—sometimes a new battery needs a moment to make full contact with the holder.
What to do if the fob still does not work
If you installed a fresh battery and the fob still does not respond, the problem is likely not the battery. The rubber buttons inside the fob can wear out over time, or the metal contacts underneath them can corrode or lose contact. In this case, you have two options: take the fob to a Nissan dealer to have it repaired or replaced, or buy a replacement fob online and have a dealer program it to your car.
Some aftermarket fobs are cheaper than dealer replacements, but you will still need a dealer or a locksmith to program the new fob to your vehicle's security system. A few Nissan models allow you to program a fob yourself using a sequence of key turns in the ignition, but this varies by year and model—check your owner's manual or call your dealer to learn about your car supports self-programming.
Storing your old battery safely
Do not throw the old battery in the trash. Coin-cell batteries contain chemicals that can harm the environment, and many areas have laws against throwing them away with regular garbage. Take the old battery to a pharmacy, supermarket, or electronics store—most have a battery recycling bin near the checkout or customer service desk. Some will take it for free; others may charge a small fee.
Recycling keeps hazardous materials out of landfills and allows the metals inside the battery to be recovered and reused. It takes only a minute to drop off your old battery, and it is the responsible choice for any battery you no longer need.
Frequently Asked Questions
How do I know if my Nissan key fob uses a CR2032 or CR2025?
The easiest way is to open the fob and look at the battery itself—the type is printed on the flat side. If you do not want to open it yet, check your owner's manual or call your Nissan dealer with your vehicle's year and model. Most modern Nissans use CR2032, which is slightly thicker than CR2025.
Can I use a different battery type if I cannot find CR2032?
CR2032 and CR2025 are not interchangeable—they have different thicknesses and voltages. Using the wrong type can damage the fob's circuit board or cause the buttons to stop working. Stick with the correct battery type. If your store is out of stock, order online or try another store rather than substituting.
Why does my fob work sometimes but not other times after I replaced the battery?
This usually means the battery is not making full contact with the metal holder, or the rubber button pads are worn. Try opening the fob again and reseating the battery to make sure it is sitting flat. If that does not help, the button contacts inside the fob may need cleaning or replacement.
Do I need to reprogram my key fob after changing the battery?
No. Changing the battery does not erase the fob's programming. As long as the fob was working before the battery died, it should work again as soon as you install a fresh battery. Reprogramming is only needed if you buy a new fob or if the fob loses its programming for another reason.
How long does a new battery last in a Nissan key fob?
A new CR2032 or CR2025 battery typically lasts three to four years in normal use. If you use your fob very frequently—pressing the buttons many times a day—the battery may wear out sooner. If you rarely use it, it may last longer.