Open the fob by sliding or prying the two halves apart
Most Nissan key fobs split into two plastic halves held together by a small slot or seam. Look for a thin line running around the edge of the fob — that is where the two pieces separate. Insert a flat tool (a coin, flathead screwdriver, or the edge of a butter knife works) into the slot and gently twist or pry until the fob cracks open. Do not force it; if you meet resistance, try a different spot along the seam.
Once the fob is open, you will see the battery sitting in a small metal or plastic holder. The battery is usually a coin-cell type, most commonly a CR2032, CR2025, or CR2016. The numbers refer to the battery's diameter and thickness — Nissan fobs typically use CR2032, but check your specific model to be sure. The battery will have a + side facing up and a − side facing down.
Remove the old battery and note its orientation
Lift the old battery straight out of its holder. Pay attention to which side was facing up — the positive (+) side should face upward when you install the new one. If the battery is stuck, use a plastic tool or your fingernail to gently pry it out. Metal tools can scratch the circuit board inside the fob.
Before you throw the old battery away, check the fob's circuit board or the inside of the plastic case for a label showing the correct battery type. Some Nissan fobs print "CR2032" or similar directly on the board. If you do not see a label, the CR2032 is the safest bet — it fits most Nissan fobs made in the last 15 years.
Insert the new battery with the positive side up
Place the new battery into the holder with the + side facing up, the same way the old one was oriented. Press it down gently until it sits flat and snaps into place. You should hear or feel a small click. Do not force it — the battery should slide in smoothly.
If the battery does not sit flush or feels loose, remove it and check that you have the right size. A CR2032 that is slightly too thick will not close the fob properly, and a battery that is too thin will rattle inside. If the fit is wrong, you have the wrong battery type.
Close the fob and test the buttons
Align the two halves of the fob so the seam lines up evenly. Press them together firmly until you hear a click or feel them snap shut. The fob should close completely with no gaps. If it does not close all the way, the battery may be upside down or the wrong size — open it again and check.
Press each button on the fob (lock, unlock, panic, trunk, etc.) and watch your Nissan to confirm it responds. If the fob does not work, open it again and make sure the battery is seated all the way down and the + side is facing up. If the fob still does not work after a second attempt, the new battery may be defective — try a different one from a different package.
Key Takeaways
- Nissan key fobs split open along a seam; use a coin or flat tool to pry the two halves apart gently.
- Most Nissan fobs use a CR2032 coin-cell battery, but check the circuit board inside the fob or your owner's manual to confirm the correct type.
- Insert the new battery with the positive (+) side facing up, the same orientation as the old one.
- Press the fob halves together until they snap shut, then test all buttons to confirm the new battery is working.
- If the fob does not work after replacement, open it again and check that the battery is fully seated and facing the correct direction.
Where to buy replacement batteries
CR2032 batteries are sold at nearly every pharmacy, grocery store, and hardware retailer in the battery aisle. Walmart, Target, CVS, Walgreens, and Home Depot all stock them. You can also order them online from Amazon or eBay. A single battery costs between $2 and $5; a pack of four or more usually costs $5 to $10 total. Name brands (Duracell, Energizer, Panasonic) last longer than generic store brands, but any CR2032 will work.
If you are unsure which battery your fob needs, bring the old battery to the store and match it to a new one. The battery type is printed on the top. You can also take a photo of the old battery and show it to a store employee in the battery section.
What to do if the fob still does not work
A new battery fixes most dead key fobs. If your fob does not respond after you replace the battery, the problem is usually one of three things: the battery is installed upside down, the battery is the wrong type, or the fob's circuit board is damaged.
Open the fob a second time and confirm the + side of the battery is facing up. If it is, try removing the battery, waiting 30 seconds, and reinserting it — sometimes this resets the fob's connection. If the fob still does not work, the circuit board may have water damage or a broken button contact. In that case, you will need a replacement fob from a Nissan dealer or a third-party fob programmed to your vehicle.
Frequently Asked Questions
Can I use a different battery type if I do not have a CR2032?
No. CR2032, CR2025, and CR2016 are different sizes and voltages. Using the wrong type may not fit in the holder, may not power the fob correctly, or may damage the circuit board. Always use the exact type printed on your old battery or listed in your owner's manual.
How long does a key fob battery last?
Most Nissan key fob batteries last three to four years with normal use. Heavy use (pressing the buttons many times per day) can shorten the life to two years. If your fob starts working only when you press the buttons hard, the battery is dying and should be replaced soon.
Do I need to reprogram my fob after changing the battery?
No. Replacing 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 it gets wet?
A dropped battery is usually fine — coin cells are tough. If it got wet, dry it completely with a cloth before inserting it. If water got inside the fob itself, leave the fob open and let it air-dry for a few hours before closing it and testing.
Can I replace the battery myself or do I need a dealer?
You can replace it yourself in about two minutes. Nissan dealers will do it for you for $10 to $20, but the battery itself costs only $3 to $5 at a store. Doing it yourself saves time and money.