You can replace a Honda Accord key fob battery yourself in under five minutes with no tools
The battery in your Honda Accord key fob will eventually run down. When it does, you do not need to visit a dealer or buy a new fob — you can swap in a fresh battery at home. The process takes about three minutes, costs between $3 and $8 for the battery, and requires nothing but your fingernail or a coin.
Honda Accord key fobs use a CR2032 battery, a flat coin-cell battery the size of a dime. You can find CR2032 batteries at any drugstore, supermarket, or hardware store, often in the watch or electronics aisle. Some dollar stores carry them as well.
Key Takeaways
- Honda Accord key fobs use a CR2032 battery, which you can buy at any drugstore or supermarket for $3 to $8.
- The fob opens by sliding a small metal tab or pressing a release button on the back, depending on your model year.
- The battery sits in a plastic holder and slides out sideways — push it gently with your thumb until it pops free.
- When you insert the new battery, the flat side faces up and the ridged side faces down into the holder.
- Test the fob before you close it by pressing the lock and unlock buttons to confirm the new battery works.
Locate the seam on the back of your fob and open it
Hold your Honda Accord key fob in your hand with the buttons facing you. Turn it over so you are looking at the back. You will see a thin seam running around the edge where the two plastic halves meet.
On most Honda Accord fobs, you can open the case by sliding a metal tab or coin into the seam and twisting gently. Look for a small notch or slot on the seam — this is where you insert your tool. A flathead screwdriver, coin, or even your fingernail works. Some newer models have a small button or release lever on the back instead — press or slide this to pop the case open.
Once you find the right spot, explore gentle pressure. The case will separate into two halves. Do not force it — if it is not opening, you may be at the wrong spot on the seam.
Remove the old battery and note which side faces up
When the fob opens, you will see the battery sitting in a plastic holder in the center. The battery is a small, flat, silver disc. Before you touch it, notice which side is facing up — the flat side or the ridged side. This matters when you put the new one in.
Push the battery gently with your thumb toward the edge of the holder. It will slide out and pop free. If it does not move easily, try pushing from the opposite direction. Once it is out, set it aside.
Insert the new CR2032 battery with the correct side facing up
Take your new CR2032 battery and hold it so the flat side is facing up. This is the positive side. Slide it into the plastic holder the same way the old one came out — it should sit flat and flush with the holder.
The battery will slide in smoothly and sit snugly. You should not have to force it. Once it is seated, the flat side should be facing up, just like the old battery was.
Test the fob before closing the case
Before you snap the case shut, press the lock button on the fob. You should hear a click or feel a vibration from your car, or see the lights flash. Press the unlock button as well. If both buttons work, the battery is installed correctly and you are ready to close the fob.
If nothing happens, the battery may be installed upside down. Open the fob again and flip the battery so the ridged side is now facing up. Test again. If it still does not work, the battery itself may be defective — try a different one.
Close the fob and confirm it works from a distance
Once the buttons respond, align the two halves of the fob and press them together firmly. You will hear or feel a click when they snap into place. The seam should be tight with no gaps.
Walk to your car and test the fob from a few feet away. Press lock and unlock and confirm your car responds. If the fob works from across the room or driveway, the battery is good and the case is sealed properly. If the range is very short or the buttons do not work at all, open the fob again and check that the battery is seated correctly.
What to do if the fob still does not work after changing the battery
If you have installed a fresh CR2032 battery with the correct side facing up and the fob still does not respond, the problem is likely not the battery. The circuit board inside may be damaged, or the buttons may be worn out. In this case, you have two options: buy a replacement fob from Honda or an aftermarket supplier, or have a locksmith program a used fob to your car.
A replacement fob from a Honda dealer typically costs $150 to $300 and includes programming. Aftermarket fobs cost $30 to $80 and may require programming at a dealer or by a locksmith for an additional fee. Before you buy a new fob, confirm that the old one is truly broken by testing it with a fresh battery one more time.
Frequently Asked Questions
Where can I buy a CR2032 battery?
CR2032 batteries are sold at drugstores, supermarkets, hardware stores, and online retailers. Check the watch or electronics aisle first, or ask a store employee. They typically cost $3 to $8 per battery, though buying a pack of two or four is often cheaper per unit.
Can I use a different battery size if I do not have a CR2032?
No. The CR2032 is the correct size for Honda Accord key fobs. Using a different battery may not fit, may not power the fob correctly, or may damage the circuit board. Always use a CR2032.
How often do I need to change the key fob battery?
Most key fob batteries last three to four years with normal use. If you use your fob frequently, the battery may drain faster. You will know it is time to change when the fob stops working from a distance or the buttons become unresponsive.
Will changing the battery erase my car's memory or settings?
No. Changing the key fob battery does not affect your car's computer, settings, or programming. The fob will work exactly as it did before once the new battery is installed.
What should I do with the old battery?
Do not throw a used battery in the trash. Take it to a drugstore, supermarket, or electronics retailer that accepts battery recycling. Many stores have a battery recycling bin near the checkout or customer service desk. Some municipalities also have hazardous waste collection days where you can drop off batteries for free.