The typical battery used in the key fob for most 2004 Honda Accord models is a CR2032, a 3-volt lithium coin cell.
That said, some regional or dealer-specific remotes may have used different coin cells, such as CR2025 or CR2016. Always verify by inspecting the battery in your current fob or checking the vehicle’s owner manual for the exact specification.
Common battery types for this key fob
Before listing the options, note that the vast majority of 2004 Accord remotes rely on a single coin-cell battery. The following sizes cover the most frequently encountered scenarios:
- CR2032 — 3V lithium coin cell (the most common for this model year)
- CR2025 — 3V lithium coin cell used in some variants or earlier deployments
- CR2016 — a less common 3V option that may appear in certain OEM or aftermarket remotes
If you're unsure which battery your fob requires, check the battery note stamped on the battery you remove or consult your owner's manual. Replacing with the correct size ensures proper fit and operation.
How to replace the key fob battery
Here's how to replace the battery in a 2004 Accord key fob while minimizing the risk of damage to the fob exterior or internal contacts.
What you’ll need
Before you start, gather a fresh battery (most often CR2032 for this model year), a small flathead screwdriver or a thin prying tool, and a clean workspace.
- Release the key blade if your fob has one, and locate the seam where the two halves of the fob meet.
- Carefully pry open the case at the seam without forcing it, and separate the two halves.
- Remove the old battery and note its orientation (which side is facing up).
- Insert the new battery with the correct orientation, ensuring it sits flat and makes full contact with the springs/contacts.
- Reassemble the fob and test the buttons to confirm the remote functions work properly.
Test the fob from a short distance to confirm that locking, unlocking, and panic functions respond as expected. If the fob seems unresponsive after replacement, recheck the battery orientation and contact cleanliness; if issues persist, consult a dealer or locksmith for assistance.
What to do if the fob still won’t work
Battery replacement resolves most issues, but other factors can prevent operation. Possible causes include worn or damaged circuitry inside the fob, corrosion on contacts, a damaged case, or the need for reprogramming or replacement of the key fob itself. In such cases, a dealership or certified automotive locksmith can diagnose and provide the appropriate remedy.
Quick tips and considerations
- Keep spare CR2032 batteries on hand for easy replacements. They’re widely available at electronics and department stores.
- Handle the fob gently when opening and reassembling to avoid cracking the plastic case or bending internal components.
Summary: For the 2004 Honda Accord key fob, CR2032 is the standard battery, with CR2025 or CR2016 as possible alternatives in less common variants. Verify by inspecting the current battery and use the correct size when replacing. If replacement doesn’t restore function, professional service may be required for reprogramming or fob replacement.