The battery type for the 2021 Honda Accord key fob is CR2032, a 3-volt lithium coin cell. This is the standard size used by Honda for this model year and is widely available.
In practice, the CR2032 coin cell fits inside the key fob to power the remote functions such as locking, unlocking, and remote start where equipped. If you’re replacing it yourself, buy a fresh CR2032 and follow the replacement steps carefully to avoid damaging the fob.
Battery type and compatibility
The 2021 Honda Accord key fob uses a CR2032 battery. This is a common, widely available coin cell, 3V lithium-based, and it fits most Honda remotes from around this era. If you have a different Honda model or a regional variant, check the owner’s manual or consult the dealer to confirm compatibility.
Replacing the battery
Follow these steps to replace the key fob battery. Having a small flathead screwdriver or a coin on hand helps, but handle the fob gently to avoid damage.
- Obtain a fresh CR2032 battery (3V) and a small flat tool or coin.
- Carefully pry open the key fob at the seam between the two halves. Work slowly to avoid cracking the plastic.
- Remove the old battery and observe which side was facing up (the orientation). Most fobs have the positive (+) side facing up toward the contacts.
- Insert the new CR2032 with the positive (+) side facing up, ensuring it seats securely on the contacts.
- Snap the fob halves back together until they click. Test the buttons to verify the remote functions work (lock, unlock, and any.Remote Start if equipped).
With the battery replaced, your Accord key fob should function normally again. If any button still doesn’t work after replacement, the issue may lie with the fob’s electronics or the vehicle’s receiver, not the battery.
Tips and considerations
Always dispose of the old battery properly and avoid touching the contacts with your fingers to reduce corrosion. If you’re unsure about opening the fob or the device won’t respond after replacement, a dealer or automotive locksmith can assist with battery replacement or reprogramming the fob.
Where to buy
CR2032 batteries are inexpensive and widely available at electronics retailers, drugstores, supermarkets, and online marketplaces. Bring the old battery to compare size if you’re unsure, but CR2032 is the standard for the 2021 Honda Accord key fob.
Summary
The 2021 Honda Accord key fob requires a CR2032 3V lithium coin cell. Replace it by prying open the fob, swapping in a new CR2032 with the correct orientation, and reassembling. Batteries are affordable and easy to find at most retailers, and the process restores full remote functionality.