Open the key fob and swap out the old battery
Most Nissan key fobs use a coin-cell battery—usually CR2032 or CR2025—that you can replace yourself without tools or a trip to the dealer. The battery sits behind a small door on the back or side of the fob. Look for a slot or seam running along the edge; slide a fingernail or a flat coin into it and gently pry the fob open. The battery will be sitting in a shallow metal holder, marked with a plus and minus sign.
Note which direction the plus side faces—this matters. Lift the old battery out with your fingernail, drop the new one in with the plus side facing the same direction, and snap the fob closed. The whole job takes about two minutes. If the fob still does not work after you replace the battery, the problem is likely the fob itself, not the battery.
Key Takeaways
- Nissan key fobs typically use CR2032 or CR2025 coin-cell batteries that you can buy at any drugstore or supermarket for two to five dollars.
- Open the fob by finding the seam on the back or side and sliding a coin or fingernail into the slot to pry it apart gently.
- Note the direction the old battery faces before removing it, then insert the new battery with the plus side facing the same way.
- If the fob still does not work after replacing the battery, the fob itself may be damaged and need repair or replacement from a Nissan dealer.
Finding the right battery size for your Nissan model
The most common battery in Nissan key fobs is the CR2032, a round silver coin about the size of a dime. Some older models use CR2025, which is slightly thinner but the same diameter. You can check which one your fob needs by looking inside the battery compartment—the size is usually printed on the metal holder, or you can check your owner's manual.
If you cannot find the size printed anywhere, take the old battery to a pharmacy or electronics store and ask them to match it. You do not need to buy a Nissan-branded battery; any CR2032 or CR2025 from a drugstore works just as well and costs much less than a dealer battery.
What to do if the fob will not open
If you cannot pry the fob open with a coin or fingernail, try a plastic spoon handle or a plastic guitar pick instead of metal—metal can scratch the fob or slip and damage the seam. Work slowly around the edge rather than forcing one spot; the fob is designed to open, so if it resists, you are probably not in the right seam.
Some Nissan fobs have a small screw instead of a snap seam. If you see a screw head on the back, use a Phillips screwdriver to remove it, then lift off the back cover. Once the screw is out, the battery swap is the same as with a snap-open fob.
Testing the fob after you replace the battery
After you snap the fob closed, stand a few feet from your Nissan and press the lock button. You should hear the doors lock and see the lights flash. Press unlock and listen for the doors to unlock. If both buttons work, the battery replacement was successful.
If nothing happens, press each button several times—sometimes a new battery needs a moment to make full contact. If the fob still does not respond after ten presses of each button, the problem is likely inside the fob itself. A Nissan dealer can test the fob's circuit board and replace it if needed, though this is more expensive than a battery replacement.
Storing spare batteries and keeping your fob working longer
Buy a spare CR2032 or CR2025 at the same time you buy the replacement battery and keep it in a drawer at home. Batteries last two to four years in a key fob depending on how often you use it, so having a spare means you will not be locked out if the battery dies unexpectedly.
To extend battery life, avoid leaving your fob in hot cars or direct sunlight for long periods. Heat drains coin-cell batteries faster than normal use. If you have a spare key fob, rotate between them—using one fob heavily while the other sits in a drawer means each battery lasts longer overall.
When to replace the whole fob instead of just the battery
If you have replaced the battery and the fob still does not lock or unlock your Nissan, the fob's internal circuit board or buttons are likely worn out. Nissan dealers sell replacement fobs, and the cost varies by model year—typically between eighty and two hundred dollars before programming. Some dealers charge an additional fee to program the new fob to your car.
Before you buy a new fob, confirm the battery is truly dead by testing it in another device if possible, or by buying a second new battery and trying again. This rules out a defective battery or a seating problem. If a second battery does not work, the fob itself needs replacement.
Frequently Asked Questions
Can I use a different battery size if I cannot find CR2032?
No. CR2032 and CR2025 are not interchangeable with other sizes. CR2032 is thicker and will not fit if your fob is designed for CR2025. Check the battery holder inside your fob or your owner's manual to confirm the correct size before you buy.
How do I know if my battery is dead or if the fob is broken?
Replace the battery first. If the fob works after the replacement, the battery was dead. If it still does not work, the fob's circuit board or buttons are damaged. You can also test the old battery in another device to confirm it is truly dead.
Will replacing the battery erase my fob's programming?
No. The battery powers the fob but does not store the programming code. Replacing the battery will not erase anything. Your fob will work exactly as it did before once the new battery is in place.
What if I lose a screw when I open my fob?
The fob will still work without the screw as long as the back cover stays closed. If the cover keeps popping off, you can buy a replacement screw at a hardware store—bring the old fob to match the size, or measure the hole with a ruler and ask for a Phillips screw that fits.
Can I buy a key fob battery online instead of at a store?
Yes. CR2032 and CR2025 batteries are widely available online and usually cost less than in-store prices. Order a pack of two or three so you have spares on hand. Shipping takes a few days, so if your fob battery is dead now, a drugstore or supermarket is faster.