The Q50 key fob battery is a standard CR2032 coin cell that you can swap yourself in under five minutes

The Infiniti Q50 key fob uses a CR2032 battery, a flat coin-shaped cell about the size of a dime. You do not need tools, a dealer visit, or any special knowledge — the fob is designed to open from the side, and the battery slides out. The whole job takes longer to find the replacement battery than to install it.

You can buy CR2032 batteries at any pharmacy, grocery store, hardware store, or online retailer for between $3 and $8 for a single cell or a pack of several. Some dollar stores and supermarket pharmacies stock them near the watch batteries. Having a spare on hand means you are never stuck with a dead fob.

Key Takeaways

  • The Q50 key fob holds a CR2032 coin-cell battery that slides out after you pry the fob open along its seam.
  • You need only the replacement CR2032 battery and a flat object like a coin or plastic pry tool — no screwdrivers or special equipment.
  • The battery costs $3 to $8 and is sold at pharmacies, grocery stores, hardware stores, and online.
  • After inserting the new battery with the positive side facing up, snap the fob halves back together and test all buttons before driving.

What you need before you start

Gather a CR2032 replacement battery and a flat object to pry with. A coin, a plastic spoon handle, a butter knife, or a plastic pry tool all work. Avoid metal screwdrivers or sharp objects that can scratch the fob casing or slip and damage the battery contacts inside.

Work on a clean, flat surface — a table or countertop — so you do not lose the battery or small internal parts if they fall. If you wear glasses, you may want them on; the battery is small and the contacts inside are tight.

Step-by-step battery replacement

Locate the seam. Hold the Q50 fob in your hand with the buttons facing you. Look for a thin line running down one side of the fob — this is the seam where the two plastic halves meet. It usually runs vertically along the edge opposite the key ring attachment.

Pry the fob open. Insert your flat object into the seam and gently twist or pry to separate the two halves. Start at one end and work your way along the seam. The fob will pop apart with light pressure; do not force it or you risk cracking the plastic. Set the front half (the one with the buttons) aside on your work surface.

Remove the old battery. Inside the back half, you will see the CR2032 battery sitting in a shallow metal holder. The positive side (marked with a + symbol) faces up. Slide the battery out toward the edge of the holder. If it is stuck, use your fingernail or the edge of your flat tool to gently lift one side.

Insert the new battery. Take your new CR2032 battery and slide it into the holder with the positive side facing up — the same direction the old one was sitting. The battery should fit snugly and sit flat in the holder. Do not force it; if it does not slide in easily, check that the positive side is facing up.

Reassemble the fob. Align the two halves so the seam lines up evenly. Press them together firmly until you hear or feel a click. The fob should be solid with no gaps along the seam. If it feels loose, pop it open again and check that the battery is seated properly.

Testing your new battery

Before you leave your work area, test every button on the fob — lock, unlock, trunk, and panic if your Q50 has one. Press each button several times and listen for the click or beep from your car. If the car responds, the battery is working. If nothing happens, open the fob again and check that the battery is inserted with the positive side up.

If the fob still does not work after you have confirmed the battery is in correctly, the problem may be internal contacts that need cleaning or a fob that needs service. In that case, a dealer can diagnose it, but a dead battery is the most common cause and the easiest to rule out.

Where to buy CR2032 batteries

CR2032 batteries are among the most common battery types in the world, so you have many options. Pharmacies like CVS and Walgreens stock them in the health and beauty section near watches and hearing aid batteries. Grocery stores often carry them in the pharmacy or checkout area. Hardware stores like Home Depot and Lowe's have them in the battery aisle. Dollar stores and supermarket pharmacies usually stock them as well.

Online, Amazon, eBay, and battery specialty sites sell CR2032 cells individually or in multipacks. A multipack costs less per battery if you want spares for other devices — remote controls, calculators, car key fobs, and some watches all use CR2032 cells. Shipping is usually fast if you order from a major retailer.

Signs your Q50 key fob battery is dying

A failing battery shows itself before it dies completely. The buttons may require harder presses or multiple presses to work. The range may shrink — you have to stand closer to the car for the lock or unlock to register. The fob may work intermittently, responding some times and not others. Any of these signs mean the battery is near the end of its life and a replacement is coming soon.

Once the battery is completely dead, the buttons will not respond at all, even with hard presses. At that point, you can still unlock your Q50 with the physical key hidden inside the fob — most Infiniti fobs have a small key blade that slides out from the bottom or side. This gets you into the car, but you will want to replace the battery to restore full fob function.

How often you need to replace the battery

A CR2032 battery in a Q50 key fob typically lasts three to four years under normal use — pressing the buttons a few times a day. Heavy use, cold weather, or a fob that is left in a hot car can shorten that lifespan. There is no way to predict exactly when yours will die, but keeping a spare CR2032 on hand means you are never caught off guard.

Once you have replaced the battery once, you know the process and can do it again in minutes whenever needed. Many owners keep a CR2032 in their glove box or at home so they do not have to make a store trip if the fob dies while they are away from home.

Frequently Asked Questions

Can I use a different battery instead of CR2032?

No. The Q50 fob is designed for CR2032 specifically, and the battery holder is sized for that cell. Other coin batteries like CR2025 or CR2016 are thinner and will not make proper contact with the terminals. Using the wrong battery risks damaging the fob or leaving you with a non-functional remote.

What do I do with the old battery?

CR2032 batteries contain lithium and should not go in the trash. Most pharmacies and retailers that sell batteries will take old batteries for recycling at no charge — ask at the customer service desk. Some communities have battery drop-off programs at recycling centers. Keeping old batteries in a container until you have several to recycle is a safe approach.

Will replacing the battery erase my Q50 settings or require reprogramming?

No. The battery powers only the transmitter that sends the lock and unlock signal to your car. Changing it does not affect any stored settings, programming, or pairing. Your fob will work exactly as it did before the battery died, with no reprogramming needed.

What if my fob still does not work after I replace the battery?

First, open the fob again and confirm the battery is inserted with the positive side facing up. If it is, the problem may be dirty or corroded contacts inside the fob, which a dealer can clean. It is also possible the fob itself is damaged or the transmitter has failed, which would require replacement rather than just a battery swap.

Can I buy a multipack of CR2032 batteries and use them in other devices?

Yes. CR2032 batteries are used in remote controls, calculators, watches, hearing aids, car key fobs, and many other small electronics. Buying a multipack is cost-effective if you have multiple devices that use them, and you will always have a spare on hand for your Q50 fob.