Open the key fob case without damaging the plastic
Most Infiniti key fobs split into two halves along a seam that runs around the edge. Look for a small slot or indentation on one side—this is where you insert a flat tool to pry the case apart. A flathead screwdriver, a coin, or a plastic spoon works well; avoid using a knife, which can slip and cut your hand.
Insert your tool gently into the slot and twist slightly to create a gap between the two halves. Once you have a small opening, work your way around the perimeter, lifting a little at each point rather than forcing one spot. The two pieces should separate cleanly without cracking the plastic. If you feel strong resistance, stop and try a different spot along the seam—you may not have found the actual opening point.
Key Takeaways
- Infiniti key fobs typically use a CR2032 or CR2025 battery, which you can find at any pharmacy, grocery store, or hardware store for a few dollars.
- The battery sits in a small metal holder inside the fob; note which side faces up before you remove it so you can install the new one the same way.
- Opening the fob requires gentle prying along the seam with a flat tool—forcing it can crack the plastic case.
- After inserting the new battery, press the two halves together firmly until they click, then test all buttons before putting the fob away.
Identify and remove the old battery
Once the case is open, you will see a small round battery sitting in a metal holder. The battery is usually silver-colored and about the size of a dime. Before you touch it, note which side is facing up—the flat side or the side with a raised edge. This matters because batteries only work in one direction.
Gently pry the battery out of its holder using your fingernail or a plastic tool. Do not use a metal screwdriver, as it can scratch the battery contacts inside the fob. The battery should come out easily; if it is stuck, try rocking it slightly side to side rather than pulling straight up.
Check the battery type and buy a replacement
Look at the top of the old battery. You will see a number stamped into it—usually CR2032 or CR2025. Write this number down or take a photo with your phone. This tells you exactly which replacement to buy. Both types are common and inexpensive; you should find them at any pharmacy, supermarket, or hardware store in the battery aisle, usually for two to five dollars.
If you cannot read the number clearly, CR2032 is the most common battery for Infiniti key fobs made in the last ten years. When in doubt, ask the store employee to confirm the type, or bring the old battery with you to match it against the new one.
Insert the new battery with the correct side facing up
Before you put the new battery in, check its orientation against the old one. The battery has a flat side and a raised side with a plus sign. The side that was facing up on the old battery should face up on the new one. If you install it backwards, the fob will not work.
Place the new battery into the metal holder and press down gently until it sits flat. You should hear or feel a small click as it settles into place. Do not force it—if it does not sit flush, remove it and check that you have the correct side facing up.
Close the fob case and test the buttons
Align the two halves of the fob so the seams match up evenly. Press them together firmly, working your way around the edge until you hear or feel a click all the way around. The two halves should be flush with no gaps. If there is a gap, open it again and check that the battery is sitting flat and that no plastic pieces are caught in the seam.
Once the case is closed, press each button on the fob—lock, unlock, trunk, and panic if your model has one. You should see the lights on your car respond, or hear the locks click. If nothing happens, open the fob again and check that the battery is making good contact with the metal holder. Sometimes a battery can shift slightly during closing and lose contact.
What to do if the fob still does not work after battery replacement
If you installed a fresh battery and the fob still does not work, the problem is usually a dirty battery contact inside the fob. Open the case again and look at the metal holder where the battery sits. If you see any green or white corrosion, wipe it gently with a dry cloth or a pencil eraser. This buildup can prevent the battery from making electrical contact.
If the contacts are clean and the fob still does not work, the circuit board inside may be damaged. This is rare but can happen if the fob was dropped or exposed to water. In this case, you will need to have the fob repaired or replaced by an Infiniti dealer or a may have access to locksmith.
Frequently Asked Questions
How long does a key fob battery usually last?
Most key fob batteries last three to four years with normal use. If you use your fob frequently—pressing buttons multiple times a day—the battery may wear out sooner. You will notice the fob working from shorter distances before it stops working entirely.
Can I use a different battery type if I cannot find the exact one?
No. CR2032 and CR2025 are not interchangeable, even though they look similar. Using the wrong type can damage the fob or cause it to malfunction. Stick with the type stamped on your old battery or printed in your owner's manual.
Is it safe to replace the battery myself, or should I go to a dealer?
Replacing the battery yourself is safe and straightforward. You do not need any special tools or training. A dealer will charge you thirty to fifty dollars for the same five-minute job. Save the money and do it at home.
What should I do with the old battery?
Most pharmacies and retailers that sell batteries also accept old ones for recycling at no charge. Do not throw it in the trash. Take it back to the store where you bought the new battery and ask where their recycling bin is located.
Will replacing the battery erase my fob's programming?
No. The battery powers the fob but does not store the programming code. Your fob will work exactly as it did before once the new battery is installed. You do not need to reprogram anything.