The Q50 key fob battery swap takes about five minutes and costs $5 to $15
Your Infiniti Q50 key fob uses a coin-cell battery—usually a CR2032 or CR2025—that dies every few years. Replacing it is straightforward: you open the fob with a flathead screwdriver, note which side of the battery faces up, swap in a new one from any pharmacy or supermarket, and snap the case closed. You do not need to reprogram the fob or visit a dealer.
The hardest part is usually getting the case open without scratching it. The battery itself costs between $5 and $15 for a pack of several, and you will have spares on hand for next time.
Key Takeaways
- Q50 key fobs hold a CR2032 or CR2025 coin-cell battery that you can buy at any pharmacy, grocery store, or online retailer.
- Open the fob by sliding a flathead screwdriver into the seam on the side, then gently pry the two halves apart.
- Note the battery orientation (which side faces up) before you remove it, then install the new battery the same way.
- You do not need to reprogram the fob after changing the battery—it will work when ready once you close the case.
What battery type your Q50 key fob uses
Most Q50 models use a CR2032 battery, which is the most common coin-cell size. Some older or regional variants may use a CR2025, which is slightly thinner but the same diameter. Both are 3-volt lithium batteries and cost roughly the same.
The easiest way to confirm which one you have is to look at the battery already in your fob before you remove it, or check your owner's manual. If you buy the wrong size, it will not fit, but the difference is obvious the moment you try to install it—no force required.
Buy a pack of two or four batteries while you are at it. They last three to four years in a key fob, and having spares means you will not be stuck if the battery dies again in a few years.
How to open the Q50 key fob case
Look at the edge of your key fob and find the thin seam that runs around the middle—this is where the two plastic halves meet. Slide a flathead screwdriver (a small one works best) into that seam on the side opposite the key ring attachment.
Once the screwdriver is seated in the seam, gently twist it to pry the two halves apart. Do not force it; if it is not moving, try a different spot along the seam. The case will separate into a front and back half, and the battery will either stay in one half or fall out—both are normal.
If the battery falls out, pick it up and note which side was facing up. This matters: the positive side (marked with a + symbol) must face the same direction when you put the new battery in.
Removing the old battery and installing the new one
If the old battery is still seated in the case, gently pry it out with the edge of your screwdriver or your fingernail. It should come free with minimal pressure.
Before you install the new battery, look at the battery compartment inside the fob. You will see a small metal contact on one side and a flat surface on the other. The positive side of the battery (the + symbol) should face the metal contact. The negative side (flat, unmarked) faces away.
Place the new battery into the compartment with the correct orientation, then press it down gently until it sits flat. It should not require force—if you are pushing hard, the orientation is probably wrong.
Closing the fob and testing it
Align the two halves of the key fob so the seam is even all the way around. Press them together firmly until you hear or feel a click. The case should be snug and not rattle.
Test the fob by pressing the lock and unlock buttons while standing near your Q50. The doors should lock and unlock normally. If nothing happens, open the fob again and check that the battery is seated properly and facing the right direction.
You do not need to reprogram the fob, visit a dealer, or do anything else. Once the case is closed and the battery is installed correctly, the fob will work when ready.
Where to buy replacement batteries
CR2032 and CR2025 batteries are sold at nearly every pharmacy, grocery store, and drugstore. Look in the watch battery or hearing aid battery section. Online retailers like Amazon also stock them, usually in multipacks that cost less per battery than buying a single one in a store.
Avoid very cheap batteries from unknown brands; stick with Energizer, Duracell, Panasonic, or store-brand batteries from a major retailer. A quality battery will last the full three to four years in your key fob.
What to do if the fob still does not work after replacing the battery
If you have installed a new battery with the correct orientation and the fob still does not work, the problem is usually one of two things: the battery is not making contact with the metal terminal inside the case, or the fob itself has a broken button or circuit.
Try opening the fob again and cleaning the metal contact point with a dry cloth or cotton swab. Sometimes dirt or corrosion prevents the battery from making a good connection. Reinstall the battery and test again.
If the fob still does not work after cleaning, the internal electronics may be damaged. At that point, you will need a replacement fob from an Infiniti dealer or a third-party supplier. A dealer can program a new fob to your Q50 in about 15 minutes; third-party fobs are cheaper but may require programming at a locksmith.
Frequently Asked Questions
Can I use a different battery size if I cannot find the exact one?
No. CR2032 and CR2025 are different thicknesses, and using the wrong one will either not fit or will not make proper contact with the terminals. Buy the correct size for your fob. If you are unsure, check your owner's manual or call an Infiniti dealer with your VIN.
Do I need to reprogram my key fob after changing the battery?
No. The fob does not store any programming in the battery itself. Once you install a new battery and close the case, the fob will work when ready without any reprogramming.
How long does a key fob battery last?
Most CR2032 and CR2025 batteries last three to four years in a key fob, depending on how often you use it. If you press the buttons dozens of times a day, the battery may die sooner. If you use it sparingly, it may last longer.
What if I drop the battery and cannot find it?
Coin-cell batteries are small and straightforward to lose. If you drop one, buy a new pack from a pharmacy or store. They cost $5 to $15 for a pack of several, so losing one is not a major expense. Keep the spare batteries in a safe place so you have them when you need them.
Can I take my Q50 key fob to a dealer to have the battery replaced?
Yes, though most dealers will charge you $20 to $50 for the service, which is more than the cost of the battery and your time to do it yourself. Many pharmacies and watch repair shops will also replace the battery for a small fee if you prefer not to open the fob yourself.