The 2010 Honda Accord key fob uses a CR2032 3-volt coin-cell battery. This is the standard size for most Accord remotes from that era and fits the compact fob housing used on this model.
Battery type and verification
In practice, the battery inside the 2010 Accord remote is a single CR2032 coin cell. To confirm, you can open the fob and read the battery label, or check the owner's manual for the key fob specifications. Honda's documentation for the 2010 Accord consistently lists CR2032 as the recommended replacement.
Using the correct size ensures proper contact with the fob's terminals and reliable transmission when you press the buttons from typical ranges.
- CR2032—3-volt coin cell (the standard battery for the 2010 Accord key fob).
If your fob seems to have a different fit or you suspect a variant, consult a dealership or car key professional to confirm the exact battery type before replacement.
How to replace the battery
Replace the battery only with a fresh CR2032 coin cell, keeping the positive side oriented as indicated in the fob's contacts. A small tool may help you pry the fob apart without damaging the casing.
- Slide the mechanical key out of the fob to expose the seam and prevent the fob from slipping while you work.
- Gently pry along the seam to separate the two halves of the fob housing, using a plastic pry tool or a small flathead screwdriver wrapped in tape to avoid scratching.
- Remove the old battery, noting its orientation so you can insert the new one correctly.
- Insert the new CR2032 with the + side facing up (toward the positive contacts in the fob).
- Align the halves and snap the fob back together; reinsert the mechanical key blade if you removed it.
- Test the remote from a short distance to ensure the lock/unlock functions, and then test again from slightly farther away.
After replacing, if the remote still shows weak performance, check for corrosion, moisture inside the case, or worn contacts. In some cases, replacing the seal or re-seating the battery connectors resolves issues.
Summary
For a 2010 Honda Accord key fob, the required battery is a CR2032 3V coin cell. Replacing it is a straightforward DIY task: open the fob, swap in a new CR2032 with the correct orientation, reassemble, and test the remote. When in doubt, a dealership, locksmith, or automotive electronics shop can assist.