The 2012 Honda Accord key fob typically uses a CR2032 3-volt lithium coin battery.
This article explains the standard battery type, how to verify it, and how to replace it safely to keep your key fob working reliably.
Identifying the correct battery
While CR2032 is the standard for most 2012 Accord remotes, some variants or aftermarket fobs may differ. To confirm, open the fob and look at the battery itself for the markings, or consult the owner's manual or a Honda service guide for your exact trim. If the old battery is missing, a dealer or battery retailer can verify the correct size.
How to replace the battery
Follow these steps to safely replace the key fob battery. The steps are typical for the 2012 Honda Accord remote; variations can occur with different fob revisions.
- Remove the mechanical key blade by sliding the release and pulling the key out of the fob.
- Open the fob case along the seam using a small flat-head screwdriver or a coin to gently pry apart the two halves.
- Take note of the battery type and orientation. Remove the old battery and observe which side is facing up; you will likely install a CR2032 with the positive (+) side facing up.
- Insert the new battery into the battery well, ensuring the orientation is correct.
- Reassemble the fob by snapping the two halves back together and reinserting the mechanical key blade.
- Test the remote by pressing the lock, unlock, and trunk buttons to confirm the replacement was successful.
If the remote still doesn’t work after replacement, recheck the battery orientation and contact surfaces for corrosion, and consider reprogramming the fob at a dealership or with a locksmith.
Tips for buying and care
Choose CR2032 batteries from reputable brands or the original equipment supplier. Avoid mixing brands or using damaged batteries. Keep the fob contacts clean and store the remote in a cool, dry place to maximize battery life.
Summary
The 2012 Honda Accord key fob commonly uses a CR2032 3V lithium coin battery. Replacing it involves opening the fob, inserting a fresh CR2032 with the correct orientation, and testing the remote. If issues persist, seek assistance from a dealer or locksmith to reprogram or inspect the fob.