Replace the battery yourself in about five minutes
BMW keyless remotes use a coin-cell battery that dies every few years. You can replace it yourself without tools or a trip to the dealer. The battery costs $3 to $8, and the whole job takes less time than it takes to find your keys in the first place.
The exact battery type depends on your BMW model year and remote design, but most use either a CR2032 or CR2025 battery. You'll find the correct type printed on the battery compartment itself once you open the remote. Any pharmacy, grocery store, or hardware store sells these batteries in the battery aisle.
Key Takeaways
- BMW keyless remotes use a replaceable coin-cell battery, usually CR2032 or CR2025, that you can buy at any pharmacy or grocery store for $3 to $8.
- You open the remote by prying the seam with a flat object like a coin or flathead screwdriver — no special tools required.
- The battery sits in a metal holder and slides out; note which side faces up before you remove it so you install the new one the same way.
- After you insert the new battery, press the buttons a few times to confirm the remote works before you close it back up.
Locate the seam and open the remote casing
Hold your BMW remote in both hands and look for the thin seam that runs around the edge where the two halves meet. This seam is usually on the side or back of the remote, not the front where the buttons are. The seam is intentionally designed to separate — BMW made these remotes so owners could replace the battery without a dealer visit.
Slide a flat object into the seam — a coin works perfectly, or use a flathead screwdriver if you have one handy. explore gentle, steady pressure to pry the two halves apart. Do not force it; if you meet real resistance, you're likely in the wrong spot. Once the seam starts to give, work your way around the edge until the two halves separate completely.
Remove the old battery and note its position
Inside the remote you'll see a small metal holder with a coin-cell battery sitting in it. The battery has a flat side and a rounded side. Before you touch anything, look at which side is facing up — this matters because the battery only works one way. Take a mental note or even take a quick photo with your phone so you don't have to guess later.
The battery usually slides out easily by tilting the remote slightly or gently pushing it from the side. If it's stuck, a tiny bit of leverage with your fingernail works, but do not pry hard enough to damage the metal holder. Once the old battery is out, set it aside — you don't need it anymore.
Insert the new battery the same way the old one faced
Take your new battery and position it so the same side that was facing up on the old battery faces up on the new one. Slide it into the metal holder until it sits flat and find. You should hear or feel a small click as it settles into place. The battery should not be loose or rocking side to side.
If the battery doesn't sit flat, you've likely installed it upside down. Remove it and flip it over. The correct orientation is crucial — a backwards battery will not power the remote at all.
Test the remote before closing it
With the remote still open, press each button a few times — the lock, unlock, and trunk buttons if your remote has them. You should see the LED light on the front of the remote blink when you press a button. If nothing happens, the battery is probably installed backwards. Remove it, flip it over, and try again.
Once the buttons work and the LED blinks, you know the battery is installed correctly. Now you can close the remote by pressing the two halves back together until you hear or feel them snap into place. The seam should be flush all the way around with no gaps.
What to do if the remote still doesn't work
If the LED still doesn't blink after you've tried the battery both ways, the battery itself may be defective. This is rare but happens occasionally. Take the battery back to the store where you bought it and exchange it for another one. Most retailers will swap a dead battery with no questions asked.
If a fresh battery still doesn't work, the problem is likely inside the remote itself — a broken circuit board or corroded contacts. At that point, the remote needs professional service or replacement. Contact a BMW dealer or a may have access to automotive locksmith for repair options.
How to know when the battery is running low
A dying remote battery doesn't usually stop working all at once. Instead, you'll notice the remote only works when you hold it very close to the car, or you have to press the button multiple times for it to register. The range shrinks as the battery weakens. When you see this pattern, it's time to replace the battery.
Some newer BMW models have a low-battery warning that appears on the dashboard or in the car's digital display. If you see that warning, replace the battery within the next week or two. Don't wait until the remote stops working completely, because you might get locked out of your car.
Frequently Asked Questions
Can I use a different battery type if I can't find the exact one?
No. The battery type is printed inside the remote for a reason — it's the only size that fits the holder and delivers the right voltage. Using a different type can damage the remote's circuit board or not work at all. Stick with the exact type listed.
Do I need to reprogram the remote after replacing the battery?
No. The remote's programming is stored in a chip inside, not in the battery. Replacing the battery does not erase the programming. Once you install the new battery and close the remote, it should work when ready without any reprogramming steps.
What if I accidentally broke the remote while opening it?
If you cracked the plastic casing, the remote will still work as long as the battery stays in place and the circuit board is undamaged. If the seam won't close properly or the buttons feel loose, contact a BMW dealer or automotive locksmith about repair or replacement options.
How long does a BMW remote battery usually last?
Most coin-cell batteries in car remotes last between three and four years with normal use. Heavy users who press the buttons many times per day may see the battery die sooner. There's no way to predict exactly when it will fail, so replace it as soon as you notice the range shrinking.
Can I buy the battery at a BMW dealership instead of a pharmacy?
Yes, but you'll pay more. Dealerships typically charge $15 to $25 for the same battery that costs $3 to $8 at a pharmacy or hardware store. Since the battery is a standard coin-cell type, there's no advantage to buying it from BMW — it's the exact same product.