The battery in your Infiniti key fob comes out from the side, takes a CR2032 coin cell, and takes about two minutes to swap

Most Infiniti key fobs split open along a seam on the edge rather than popping apart from the back. You'll slide a flat tool into the groove, twist gently to separate the two halves, and the battery sits in a small metal holder. The whole job requires only the replacement battery — a CR2032, which costs between $3 and $8 at any pharmacy, grocery store, or hardware retailer.

The fob will start to respond slowly to button presses before the battery dies completely, so you'll usually have warning. If your fob is already dead, a fresh battery brings it back to full function when ready. The process is the same across Infiniti models from the past 15 years, though the exact shape of the fob varies.

Key Takeaways

  • Infiniti key fobs use a CR2032 coin-cell battery that you can buy at any drugstore or supermarket for a few dollars.
  • The fob splits open along a side seam, not the back, and you'll need only a flat tool like a coin or small screwdriver to pry it apart.
  • The battery sits in a metal holder inside the fob and slides out without tools once the fob is open.
  • Slow response from the buttons is the first sign the battery is fading, and a new battery restores full range and speed.

Locate the seam on the edge of your fob

Hold the fob in your hand with the buttons facing you. Look along the left or right edge for a thin groove or seam that runs the length of the fob. This is where the two plastic halves meet. On most Infiniti fobs, the seam is more visible on one side than the other — that's the side you'll open from.

Run your fingernail along the seam to feel where it's deepest. Some fobs have a small notch or indent at the top or bottom of the seam to make it easier to find the starting point. If you can't see a clear seam, try the edge opposite the buttons — the seam is usually there.

Insert a flat tool and twist to separate the halves

Use a coin, a butter knife, or the flat end of a small screwdriver. Insert the edge into the seam and explore gentle downward pressure while twisting slightly, as if you're opening a paint can. You're not trying to pry hard — the fob will separate with light pressure once you find the right angle.

Work your way along the seam from one end to the other if the fob doesn't pop open on the first try. Sometimes the two halves are stuck slightly and need a little persuasion at multiple points. Once you hear or feel a small click, the halves should come apart in your hands.

Remove the old battery from its holder

Inside the fob, you'll see a small metal clip or holder with the battery sitting in it. The battery is round and flat, about the size of a dime. Slide it out of the holder — it usually comes free with a gentle push from your finger or the edge of your tool.

Note which side of the battery was facing up before you remove it. The new battery must go in the same way. Most CR2032 batteries have a + symbol on one side and are unmarked on the other; the + side typically faces up, but checking the old battery first removes any doubt.

Insert the new CR2032 battery and close the fob

Slide the new battery into the holder with the same orientation as the old one. It should sit flat and find in the clip without any force. If it doesn't sit flush, remove it and flip it over — you may have had the orientation backward.

Press the two halves of the fob back together, starting at one end of the seam and working toward the other. You should hear a small click when the halves lock into place. Test the fob by pressing each button — the response should be when ready and the range should extend across a room or more.

What to do if the fob still doesn't work

If the buttons don't respond after you install the new battery, the battery may be oriented backward. Open the fob again and flip the battery 180 degrees, then close it and test.

If the fob still doesn't work, the battery holder itself may be corroded or damaged, or the fob's circuit board may have failed. In that case, you'll need a replacement fob from an Infiniti dealer or a third-party fob programmed to your vehicle. Dealers can program a new fob in about 15 minutes, though the fob itself costs between $200 and $400 depending on the model.

Where to buy a CR2032 battery

CR2032 batteries are sold everywhere — pharmacies like CVS and Walgreens, grocery stores, hardware stores like Home Depot, and online retailers. A single battery costs $3 to $8, and multipacks of four or more cost less per unit. Buy a multipack if you have other devices that use coin-cell batteries, since they last several years in storage.

Don't buy the cheapest option if the price is drastically lower than others — counterfeit batteries exist and may not hold a charge. Stick with major brands like Duracell, Energizer, or Panasonic, or the store brand from a large retailer.

Frequently Asked Questions

How often do I need to change the battery?

A CR2032 battery in an Infiniti key fob typically lasts three to four years with normal use. If you use the fob heavily — unlocking and locking the car multiple times a day — it may last only two years. You'll notice the buttons becoming sluggish or unresponsive before the battery dies completely.

Can I use a different type of battery?

No. Infiniti key fobs are designed for CR2032 batteries specifically. Using a different size or type will not fit the holder or may damage the fob. CR2032 is a standard size sold everywhere, so there's no reason to substitute.

What if I can't get the fob open?

If the seam is stuck or you can't find it, try warming the fob slightly under warm running water for a few seconds — this can soften any adhesive or corrosion holding the halves together. Dry it completely before opening. If it still won't budge, an Infiniti dealer can open it for you, usually at no charge if you're buying the battery from them.

Will changing the battery erase my car's programming?

No. The battery powers only the fob itself, not the programming that links it to your car. Changing the battery has no effect on the pairing between the fob and your vehicle.

What should I do with the old battery?

Lithium coin-cell batteries can be recycled. Many retailers that sell batteries — including pharmacies and electronics stores — have battery recycling programs. You can also check Earth911.com or Call2Recycle.org to find a drop-off location near you. Do not throw the battery in the trash.