The battery in your 2022 Mazda CX-5 key fob is a coin-cell battery you can replace yourself in about five minutes

Your key fob uses a CR2032 battery, a flat, round battery about the size of a dime. When your key fob stops locking or unlocking the car from a distance, a dead battery is usually the cause. You can buy a replacement CR2032 battery at any drugstore, supermarket, or hardware store for between $3 and $8. The replacement itself requires no tools beyond what you likely have at home — a flathead screwdriver or even a coin will work.

The whole process takes longer to read about than to do. You'll open the fob, remove the old battery, drop in the new one, and snap it back together. No programming is needed afterward; the key fob will work when ready.

Key Takeaways

  • A CR2032 battery powers your 2022 CX-5 key fob and costs $3 to $8 at most retailers.
  • You can open the fob with a flathead screwdriver or coin by prying gently at the seam between the two halves.
  • The battery sits in a metal holder and slides out; note which side faces up before you remove it.
  • Insert the new battery with the same side facing up, close the fob, and test it when ready — no reprogramming required.
  • If the fob still doesn't work after a new battery, the fob itself may be damaged and need replacement.

What you'll need before you start

Gather these items before you begin. You need a CR2032 replacement battery — this is the only part you must buy. A flathead screwdriver works best for opening the fob, but a coin (penny, dime, or quarter) will also work if you're gentle. Some people use a butter knife or the edge of a credit card. The goal is to pry the two halves of the fob apart without scratching it, so avoid anything sharp or pointed that could slip and damage the plastic.

You don't need a workspace or special conditions. You can do this at your kitchen table, in your car, or anywhere you have a flat surface and good light. Keep the old battery and any small screws in a safe spot while you work — the 2022 CX-5 key fob doesn't have screws holding it together, but it's good practice anyway.

How to open the key fob

Look at the edge of your key fob where the two halves meet. You'll see a thin seam running around the perimeter. This is where the fob splits open. Insert your flathead screwdriver or coin into this seam on the side opposite the key ring attachment. Push gently but firmly — you're not forcing it, just explore steady pressure to separate the two plastic halves.

The fob will pop open with a small click. Don't pry too hard or you risk cracking the plastic. If it's not budging, try a different spot along the seam. Once one edge starts to separate, you can work your way around the seam, gently prying as you go, until the two halves come apart completely. Set the metal battery holder and circuit board aside carefully — they're connected but not glued, so they'll stay together.

Removing and replacing the battery

Inside the fob, you'll see a small metal holder with a coin-shaped battery sitting in it. The battery has a flat side and a slightly raised side. Before you remove it, note which side is facing up — this matters because the battery only works one direction. Take a mental picture or write it down if you're unsure.

Slide the old battery out of the metal holder. It should come out easily; if it's stuck, use your fingernail or the edge of your screwdriver to gently pry it up. Drop the new CR2032 battery into the holder with the same side facing up as the old one. The battery should sit flat and snug in the holder. If it's loose or tilted, remove it and reposition it.

Closing the fob and testing it

Line up the two halves of the fob so the seam is even all the way around. Press them together firmly until you hear or feel a click. The fob should close completely with no gaps. If there's a gap, open it again and check that the battery holder is seated properly inside.

Test the key fob when ready by pressing the lock and unlock buttons while standing near your car. You should hear the car lock or unlock, and you may see the lights flash. If it works, you're done. If it doesn't work, open the fob again and double-check that the battery is inserted with the correct side facing up. A battery installed backward won't work at all.

What to do if a new battery doesn't fix the problem

If you've installed a fresh CR2032 battery and the fob still doesn't work, the problem isn't the battery. The fob itself may have internal damage — a cracked circuit board, water damage, or worn contacts inside the battery holder. In this case, you'll need to replace the entire key fob rather than just the battery.

A replacement key fob for a 2022 CX-5 costs between $150 and $300 depending on where you buy it and whether it includes programming. You can order one online, buy one from a Mazda dealership, or purchase an aftermarket fob from an auto parts store. Some dealerships will program a new fob for you; others charge an additional fee. If you buy an aftermarket fob, confirm it's compatible with your 2022 CX-5 before purchasing.

How to know if your battery is actually dead

A dead key fob battery shows specific signs. The lock and unlock buttons stop working from a distance, but the buttons themselves still click when you press them. You might notice the range getting shorter over time — the fob works only when you're very close to the car — before it stops working entirely. The buttons may also feel less responsive or require harder pressing.

If the buttons don't click at all when you press them, or if the fob fell in water recently, the problem may not be the battery. Water damage and internal circuit failure require fob replacement, not just a battery swap. But if the buttons click and the fob straightforward doesn't communicate with the car, a new battery will almost certainly fix it.

Frequently Asked Questions

Can I use a different battery instead of a CR2032?

No. The CR2032 is the only battery that fits the 2022 CX-5 key fob. Other coin-cell batteries like the CR2025 or CR2016 are slightly different sizes and won't work. Always buy a CR2032 specifically.

Do I need to reprogram the key fob after changing the battery?

No. The fob doesn't need reprogramming after a battery change. It will work when ready once you close the fob and test it. Reprogramming is only necessary if you buy a completely new fob.

What should I do with the old battery?

Take the old battery to a retailer that accepts battery recycling — most drugstores, supermarkets, and auto parts stores have a battery drop-off bin near the checkout. Don't throw it in the trash. Some retailers will take it for free; others charge a small fee.

How often do I need to replace the battery?

A CR2032 battery in a key fob typically lasts three to four years with normal use. If you use the fob frequently, it may need replacement sooner. Once you replace it, you won't need another one for several years.

What if I drop the fob in water?

If your fob gets wet, open it when ready and let both halves dry completely for at least 24 hours before closing it again. You can place the parts in a container of uncooked rice to absorb moisture. Once dry, reassemble and test it. If water got inside and damaged the circuit board, the fob won't work even after drying, and you'll need a replacement.