The 2021 Honda Accord key fob uses a CR2032 3-volt lithium coin battery. This is the standard size for Honda’s smart-key remotes in that generation.
Across most trims of the 2021 Accord, the remote’s operation relies on this single coin cell. If the fob stops functioning, replacing the battery is a common, at-home fix. The exact design of the fob can vary slightly by trim, but CR2032 is the typical specification for this model year.
Battery type and replacement basics
To get started, know what you need and what to expect when replacing the battery in your Accord key fob.
- CR2032 battery (3V lithium coin cell)
- Small flathead screwdriver or a coin to pry open the fob
- Clean hands or a soft cloth to handle the battery without fingerprints
With the right tools and battery on hand, you can replace the fob’s battery and restore keyless entry functionality.
Step-by-step replacement guidance
Follow these practical steps to replace the battery, minimizing the chance of damage to the fob.
- Turn the fob over and locate the seam at the back; use a coin or small flathead to pry the back cover gently open
- Carefully remove the back cover and set it aside
- Take out the old battery, noting which side was facing up
- Insert a new CR2032 with the positive (+) side facing up
- Snap the back cover back into place and test the fob buttons to confirm functionality
If the fob still doesn’t work after replacement, the issue may lie with the electronics or the immobilizer system, and a dealership diagnostic may be required.
Where to buy and care
Batteries for the 2021 Honda Accord key fob are widely available and easy to source. Buying tips and disposal guidance help ensure you’re prepared and responsible.
Availability and price
CR2032 batteries are commonly sold at auto parts stores, electronics shops, supermarkets, and Honda dealers. Prices vary by brand and location, but you can generally expect a few dollars per battery. Check for a battery with a fresh expiration date to maximize longevity.
Dispose of or recycle depleted batteries according to local guidelines, and consider keeping a spare on hand to minimize downtime if the fob dies again.
Summary
For the 2021 Honda Accord, the key fob relies on a CR2032 3V lithium coin battery. Replacing it is a straightforward at-home task: open the fob, swap in a new CR2032 with the correct orientation, reassemble, and test. Battery availability is broad, and proper disposal practices help protect the environment. A fresh battery typically restores full remote functionality without needing a trip to the dealer.