What you need to do to replace a key fob battery
Replacing the battery in a Nissan Altima key fob takes about five minutes and costs between $5 and $15 for the battery itself. You do not need to visit a dealer or a mechanic — you can do this at home with a coin and a replacement battery. The battery type varies slightly by model year, but most Altimas from 2007 onward use a CR2032 battery, which you can find at any pharmacy, grocery store, or hardware store.
The process is straightforward: you pry open the fob with a coin, remove the old battery, note which direction it faces, insert the new one the same way, and snap the fob back together. If your fob is not responding after you replace the battery, the problem is usually either the battery was inserted backwards or the fob itself needs professional service — but the battery replacement itself rarely fails.
Key Takeaways
- Most Nissan Altima key fobs use a CR2032 battery, which costs $5 to $15 and is sold at pharmacies, grocery stores, and hardware stores.
- You open the fob by inserting a coin into the slot on the side and twisting gently until the two halves separate.
- The battery sits in a small metal holder; note which side faces up before you remove it, then insert the new battery the same way.
- After you close the fob, test all buttons to confirm the battery is working before you put the fob away.
Finding the right battery for your Altima
The CR2032 is the standard battery for Nissan Altima key fobs, but you should confirm this matches your model before you buy. Check your owner's manual or search online for your specific year and model — for example, "2015 Nissan Altima key fob battery" — to see what size is listed. If you cannot find the information, you can also open the old fob first and look at the battery itself; the size is printed on the top.
CR2032 batteries are sold everywhere: CVS, Walgreens, Target, Walmart, Amazon, and most auto parts stores all carry them. A single battery usually costs between $5 and $15 depending on the brand and where you buy it. Some stores sell multipacks if you want to keep spares on hand. Do not buy the cheapest option if the brand is unfamiliar — a reliable brand like Energizer, Duracell, or Panasonic will last longer and is worth the small difference in price.
How to open the key fob safely
The Nissan Altima key fob has a small slot on one of the long sides. Insert a coin — a dime or penny works well — into that slot and twist gently. You are not forcing it; the two halves of the fob are designed to separate with light pressure. If you twist too hard, you risk cracking the plastic, so go slowly and let the coin do the work.
Once the fob begins to open, you can usually pull the two halves apart by hand. Set the metal battery holder and the circuit board aside on a clean surface where you will not lose them. The battery sits in a small metal cradle; do not touch the circuit board itself, as oils from your fingers can damage it.
Removing and replacing the battery
Look at the battery in its metal holder and note which side is facing up — the side with the + symbol should be visible. This matters because the battery will not work if you insert it backwards. Gently pry the battery out of the metal holder using a coin or your fingernail. Do not force it; it should come out with light pressure.
Take the new CR2032 battery and insert it into the metal holder with the + side facing the same direction as the old battery was facing. You should hear or feel a small click as it seats. If the battery does not sit flat or feels loose, remove it and try again — it should fit snugly in the holder.
Closing the fob and testing it
Once the new battery is in place, align the two halves of the fob and press them together firmly until you hear a click. The fob should close smoothly; if it feels like something is pinched, open it again and make sure the battery holder and circuit board are positioned correctly.
Before you put the fob away, test every button — lock, unlock, and panic if your model has one — to confirm the battery is working. Press each button several times to make sure the response is consistent. If a button does not work, open the fob again and check that the battery is inserted correctly with the + side facing up. If the buttons still do not work after you have confirmed the battery is in the right position, the fob may have a different problem that requires professional service.
What to do if the new battery does not work
If you have replaced the battery and the fob still does not respond, the most common cause is the battery was inserted backwards. Open the fob again and flip the battery so the + side faces the opposite direction, close it, and test. If that does not work, try removing the battery, waiting 30 seconds, and reinserting it — sometimes the connection needs to be reset.
If the fob still does not work after you have tried these steps, the problem is likely inside the fob itself: a broken button, a damaged circuit board, or corrosion on the contacts. At that point, you have two options. You can take the fob to a Nissan dealership and ask them to repair or replace it, which usually costs $150 to $300 depending on whether they repair the existing fob or give you a new one. Alternatively, you can search online for a replacement key fob for your model year, which often costs $30 to $80 and comes with instructions for programming it to your car.
Frequently Asked Questions
Can I use a different battery size if I cannot find a CR2032?
No. Using a different size battery can damage the fob or cause it to malfunction. CR2032 batteries are widely sold and inexpensive, so it is worth taking the time to find the correct one. If your local stores are out of stock, you can order one online and have it arrive within a day or two.
How often do I need to replace the key fob battery?
A CR2032 battery typically lasts three to four years in a key fob, depending on how often you use it. You will notice the fob becoming less responsive — buttons taking longer to work or requiring multiple presses — before the battery dies completely. When that happens, it is time to replace it.
Will replacing the battery erase my car's settings?
No. Replacing the key fob battery does not affect your car's computer or any stored settings. The fob and the car communicate wirelessly, so changing the battery in the fob has no impact on the vehicle itself.
What if I lost the old battery and do not know which direction it faced?
The + symbol should face toward the top of the fob (away from the buttons). If you insert it that way and the fob does not work, try flipping it. You will figure out the correct direction within two tries.