Most car remotes use a coin-cell battery you can swap yourself in under a minute
Your car remote runs on a small coin-shaped battery — usually a CR2032, CR2025, or similar model — that you can buy at any drugstore or supermarket for a few dollars. The battery sits inside the remote's plastic case, which opens with a flat tool like a coin or screwdriver. Once you pry the case apart, you'll see the battery held in a metal clip. Push it out, drop in the new one the same way it came out, and snap the case closed. The whole job takes less than a minute and requires no special tools or knowledge.
The only real decision is whether to do it yourself or have a dealer or locksmith handle it. Doing it yourself costs the price of the battery — typically $3 to $8. A dealer or locksmith will charge $25 to $75 for the same work, mostly for labor. If you're comfortable opening a plastic case and swapping a battery, there's no reason to pay someone else to do it.
Key Takeaways
- Car remotes almost always use a standard coin-cell battery like CR2032 that you can buy at any pharmacy or grocery store for a few dollars.
- You open the remote by prying the plastic case apart with a flat tool, then push the old battery out of its metal clip and insert the new one in the same direction.
- The battery type and correct direction are usually printed inside the remote case or on the battery clip itself.
- If the remote still doesn't work after you replace the battery, the problem is likely a worn button contact or broken circuit board, not the battery.
Finding the right battery type for your remote
The battery model number is almost always printed on the inside of your remote case or stamped into the metal battery clip. Common types are CR2032 (the most frequent), CR2025, CR2016, and a few others. Before you open the remote, check your owner's manual or search online for your car's make, model, and year plus "remote battery" — this usually tells you the exact type in seconds.
If you can't find the model number, open the remote and look at the battery itself or the clip holding it. The number is printed right there. Take a photo with your phone and bring it to a pharmacy, drugstore, or electronics store. Staff can match it when ready. You can also order the correct battery online if you know the number, though you'll wait for shipping.
Buy one or two extra batteries while you're at it. They cost almost nothing, last for years in a drawer, and you'll have a replacement ready when the next remote dies.
The step-by-step process for opening and replacing the battery
Start by finding the seam where the remote's plastic case splits in half. Most remotes have a small notch or groove on one edge designed for a flat tool. Insert a coin, flathead screwdriver, or plastic pry tool into the notch and gently twist or pry until the case cracks open. Don't force it — a steady, gentle pressure works better than sudden force, which can crack the plastic permanently.
Once the case is open, you'll see the battery sitting in a metal clip or holder. The battery has a flat side and a rounded side. Note which side is facing up — this matters. Push the battery gently toward the clip's spring end until it pops out. Drop the new battery in the same way the old one came out, with the same side facing up. Push it down until the clip holds it snugly.
Close the case by pressing the two halves together until they snap. You should hear or feel a click. Test the remote on your car to make sure it works. If it does, you're done. If it doesn't, open it again and check that the battery is seated correctly and facing the right direction.
What to do if the remote still doesn't work after replacing the battery
If a fresh battery doesn't fix the problem, the issue is almost certainly not the battery itself. The most common culprit is worn or corroded button contacts inside the remote. Over time, the rubber pads under the buttons wear thin or the metal contacts underneath get dirty, and the button stops sending a signal even though the battery is fine.
You can sometimes fix this by cleaning the contacts. Open the remote again and look at the rubber button pad — it's usually a separate piece that lifts out. The underside has small metal or conductive circles. Gently rub these circles with a pencil eraser or a cotton swab barely dampened with rubbing alcohol. Let it dry completely, reassemble the remote, and test it. This works surprisingly often.
If cleaning doesn't help, the circuit board inside the remote may be damaged, or the transmitter itself may have failed. At that point, replacement is usually cheaper than repair. A new remote from a dealer costs $50 to $200 depending on the car. Aftermarket remotes from online retailers cost $15 to $50 and work with most vehicles, though you may need to program them to your car — your owner's manual or a dealer can tell you how.
Programming a new remote after battery replacement
If you replace just the battery in an existing remote, no programming is needed. The remote already knows your car. But if you buy a new remote to replace a broken one, you'll need to program it so your car recognizes it.
Programming steps vary widely by car make and model. Some cars let you program a new remote yourself by sitting in the driver's seat and turning the key on and off in a specific pattern, then pressing buttons on the new remote. Others require a dealer or locksmith to program it using special equipment. Check your owner's manual for the exact steps for your car, or search online for your car's make, model, and year plus "program remote."
A dealer will program a new remote for you, usually for $50 to $100 plus the cost of the remote itself. A locksmith often charges less. If you buy an aftermarket remote online, confirm before you buy that it's compatible with your car and that you can program it yourself — some require dealer programming, which adds cost.
When to replace the battery versus buying a new remote
Replace the battery if your remote is otherwise working fine — the buttons feel responsive, the case isn't cracked, and it just stopped responding. A fresh battery will almost certainly fix it, and the cost is minimal.
Buy a new remote if the case is cracked or water-damaged, the buttons are stuck or mushy, or the remote has been dropped repeatedly. These signs mean the remote itself is failing, not just the battery. Replacing the battery in a damaged remote is a waste of money because the remote will fail again soon.
If you have an older car and the remote is straightforward old, a new remote might be worth it anyway. Newer remotes sometimes have better range or additional buttons for features your car supports. Check what's available for your car before deciding.
Frequently Asked Questions
Can I use a different battery type if I can't find the exact one?
Not reliably. Different coin-cell batteries have different voltages and sizes. Using the wrong type can damage the remote's circuit board or cause it to malfunction. Stick with the exact model number printed on the battery clip or in your manual. If you can't find it locally, order it online — it costs just a few dollars and arrives in a day or two.
Does it matter which side of the battery faces up?
Yes. The battery has a flat negative side and a rounded positive side. The metal clip in your remote is designed to hold it one specific way. If you put it in backward, the remote won't work. Look at how the old battery was oriented before you remove it, or check the inside of the case — it's usually marked with a + or - symbol showing which side goes up.
What if I can't get the remote case open?
Try a different tool. A coin works for some remotes, a flathead screwdriver for others, and a plastic pry tool (like a guitar pick or old credit card) for remotes with delicate cases. Look for the seam and explore steady, gentle pressure rather than sudden force. If you're worried about breaking it, a locksmith or dealer can open it for you, though you'll pay for the service.
Will a new battery fix a remote that got wet?
Maybe, but probably not permanently. Water can corrode the circuit board and button contacts. A new battery might make it work temporarily, but the remote will likely fail again soon. If your remote got wet, let it dry completely for at least 24 hours before opening it. If it still doesn't work after a battery replacement and contact cleaning, the damage is probably too deep to fix.
Can I use rechargeable batteries in my car remote?
Rechargeable coin-cell batteries exist, but they're not recommended for car remotes. They have a lower voltage than standard batteries, which can cause the remote to work poorly or not at all. Stick with standard single-use coin-cell batteries. They're cheap and last a long time, so there's no real advantage to recharging.