You can replace an Acura key fob battery yourself in about five minutes with a coin and a new battery
Most Acura key fobs use a coin-cell battery—usually a CR2032 or CR2025—that you can buy at any drugstore, supermarket, or hardware store for two to five dollars. The fob itself has a seam you can pry open with a coin, and once it's apart, the old battery slides out and the new one slides in. You do not need any special tools, and you do not need to visit a dealer.
The whole job takes about five minutes. The hardest part is not losing the small rubber gasket that sits between the two halves of the fob—it keeps water out, and if you drop it or forget to put it back, your fob can stop working when it gets wet.
Key Takeaways
- Acura key fobs typically use a CR2032 or CR2025 coin-cell battery that costs two to five dollars and is sold at most stores.
- You open the fob by finding the seam on its edge and prying gently with a coin, then separate the two halves carefully.
- The rubber gasket between the two halves must stay in place or go back in the same position, or water can damage the fob later.
- The battery slides out of a small metal clip and the new one slides in the same way, with the flat side facing up.
What battery your Acura key fob needs
Check your owner's manual or look at the back of your fob to find out which battery type it uses. Most Acura fobs made in the last ten years use either a CR2032 (the most common) or a CR2025. Both are coin-shaped, about the size of a dime, and sold in the battery aisle of drugstores, supermarkets, and hardware stores. A single battery costs between two and five dollars, and many stores sell them in packs of two or four.
If you cannot find the battery type printed on your fob, call your Acura dealer with your vehicle's year and model, and they will tell you which one to buy. Do not guess—putting the wrong battery in can damage the fob's circuit board.
How to open the fob without breaking it
Look at the edge of your key fob for a small seam or slot running around the perimeter. This is where the two halves of the fob meet. Slide a coin—a dime or penny works well—into the seam and turn it gently, as if you were opening a paint can. You are not trying to force it; you are just explore steady pressure to separate the two halves.
Once you feel the halves start to come apart, stop twisting and use your fingers to pull the two pieces away from each other. If it feels stuck, try a different spot on the seam. Do not pry hard enough to crack the plastic—Acura fobs are designed to open this way, and gentle pressure is all you need.
As soon as the fob opens, you will see a rubber gasket (a thin ring) sitting between the two halves. This gasket keeps water out of the fob. Set it aside in a safe place where you will not lose it—you will put it back in the same position when you reassemble the fob.
Removing the old battery and installing the new one
Inside the fob, you will see a small metal clip holding the battery in place. The battery sits flat in this clip, usually with the flat side facing up. Gently lift one edge of the battery with your fingernail or the edge of a coin to pop it out of the clip. The old battery will slide out easily.
Before you install the new battery, check which side is marked. Most coin-cell batteries have a plus sign (+) stamped on one side and a minus sign (−) on the other. The plus side should face up, toward the top of the fob. Slide the new battery into the metal clip, flat side up, until it sits flush. You should hear or feel a small click as it settles into place.
Test the fob before you close it. Press the lock and unlock buttons a few times. If the fob works, you are ready to reassemble. If it does not work, remove the battery, flip it over, and try again—you may have installed it upside down.
Putting the fob back together
Before you close the fob, make sure the rubber gasket is sitting in its groove on one of the two halves. It should lie flat and cover the entire seam. If it is twisted, folded, or missing, straighten it out or put it back in place. A gasket that is not seated properly will let water in and damage the fob's electronics.
Align the two halves so the seam lines up evenly all the way around. Press them together firmly until you hear a click or feel them snap into place. The fob should feel solid and not have any gaps. If there are gaps, the gasket may not be seated correctly—open it again and check.
Common mistakes that stop the fob from working
The most common mistake is installing the battery upside down. If your fob does not work after you close it, open it again and flip the battery over. The plus side should face up.
The second most common mistake is losing or misplacing the rubber gasket. If you cannot find it, the fob will still work, but it will be vulnerable to water damage. If you lose the gasket, contact your Acura dealer—they can sell you a replacement gasket for a few dollars.
A third mistake is not pressing the two halves together hard enough. If the fob feels loose or has visible gaps, open it again and press the halves together more firmly until they click. A loose fob can let water in and cause the battery to lose contact with the clip.
When to take your fob to a dealer instead
If you open the fob and the battery is corroded (covered in white or blue powder), the fob may have water damage. In this case, replacing the battery alone may not fix it. A dealer can inspect the circuit board and tell you whether the fob can be repaired or needs to be replaced.
If you install a new battery and the fob still does not work, the problem is likely not the battery. The circuit board may be damaged, or the buttons may be worn out. Contact your Acura dealer to discuss repair or replacement options.
Frequently Asked Questions
Can I use a different type of battery if I cannot find the right one?
No. Using the wrong battery can damage the fob's circuit board or cause it to stop working. If you cannot find the correct battery type at local stores, order it online or call your Acura dealer. The correct battery is inexpensive and widely available.
How often do I need to replace the battery?
Most Acura key fob batteries last three to four years with normal use. If your fob starts to work only when you hold it close to the car, or if the buttons feel sluggish, the battery is probably running low. Replace it at that point.
What should I do if I drop the rubber gasket and cannot find it?
The fob will still work without the gasket, but it will not be waterproof. If you lose it, contact your Acura dealer and ask for a replacement gasket. In the meantime, keep the fob away from water and moisture.
Do I need to reprogram the fob after I replace the battery?
No. Replacing the battery does not erase the fob's programming. Once you install the new battery and close the fob, it should work when ready without any additional steps.
Can I replace the battery in a smart key or push-button fob the same way?
Most Acura smart keys and push-button fobs open the same way and use the same coin-cell batteries. However, some newer models may have a different design. Check your owner's manual or contact your dealer if you are unsure how to open your specific fob.