The battery most commonly used in contemporary Honda Accord key fobs is a CR2032 3-volt lithium coin cell. This size covers the majority of newer Accords, while some older models may use CR2025. To be sure, check the fob itself, the owner's manual, or the back of the battery tray for the printed size.
In this article, we explain the typical battery sizes you might encounter, how to identify the correct one for your specific car, and step-by-step instructions to replace the battery safely without damaging the fob.
Common battery sizes you may encounter
Most newer Honda Accord remotes use CR2032. Some older or regional variants may use CR2025. The exact size depends on the model year and fob design, so verify before purchasing a replacement.
- CR2032 — 3V lithium coin cell; standard in most current Honda Accord key fobs.
- CR2025 — 3V lithium coin cell; appears in some older or regional fobs.
To confirm the exact size for your specific car, inspect the current battery inside the fob. If the size is printed on the battery edge or on the fob's battery cover, use that size. When unsure, CR2032 is the most commonly compatible option, but ensure it matches your fob's design.
Why the size matters
The coin cell size determines the fit inside the fob, the contact arrangement, and the battery life. Using the wrong size can prevent the fob from powering correctly or fit poorly, so always verify with the manual or the existing cell.
Replacing the battery
When you’re ready to swap the battery, follow these careful steps to avoid damaging the fob.
- Gather a small flathead screwdriver or plastic opening tool, and a replacement coin cell of the correct size for your fob (most modern Accords use CR2032).
- On most Honda fobs, slide out the hidden mechanical key or flip the fob over to locate the seam where the two halves meet.
- Carefully pry the two halves apart along the seam. Work slowly to avoid cracking the plastic.
- Remove the old battery and note its orientation (the plus side is usually facing up toward you).
- Insert the new battery with the plus (+) side facing the correct direction, seating it flat against the contacts.
- Snap the fob halves back together, reinsert the mechanical key if you removed it, and press the buttons to test the remote.
- If the remote still doesn’t respond after replacing the battery, the fob may require reprogramming or could have a defective circuit. Contact a Honda dealer or a locksmith for assistance.
Summary
For most Honda Accord owners, the key fob battery is the CR2032 3V lithium coin cell. Always verify the exact size for your model year by inspecting the old battery or consulting the owner's manual. Replacing the battery is a straightforward DIY task: pry open the fob, swap in a fresh coin cell of the correct size, reassemble, and test the remote.