Most Honda key fobs use a 3-volt lithium coin cell, with CR2032 being the standard for modern models. Some older remotes may use CR2025. To be certain, check the battery inside your fob or refer to your vehicle’s owner’s manual.
This article explains the typical battery types you’re likely to encounter, how to identify the correct one for your Honda key fob, and how to replace it safely. We also cover what to do if the fob stops working after replacement.
Typical battery types for Honda key fobs
Here’s a quick guide to the batteries you’re most likely to encounter in Honda remotes.
- CR2032 — 3-volt lithium coin cell; the most common choice for recent Honda key fobs (from the 2010s to today).
- CR2025 — 3-volt lithium coin cell; found in some older or smaller remotes and regional variants.
Before replacing, confirm the exact type for your vehicle, because using the wrong size can damage the fob or prevent it from working.
How to identify the correct battery and replace it
If you’re replacing the battery yourself, follow these steps. Make sure you have the right type for your fob before starting.
- Inspect the back of the fob to locate the seam or release notch, then gently pry it open with a small coin or plastic tool.
- Take note of the battery’s size and polarity (which side is positive). Remove the old battery carefully.
- Insert a new CR2032 or CR2025 with the correct orientation, placing it flat and ensuring it sits securely.
- Snap the back cover back on and test the fob by pressing a button to confirm operation from a short distance.
After replacement, keep the fob clean and dry, and test it again from different distances to ensure reliable operation. If it still doesn’t respond, re-check the battery type and orientation or try a fresh battery of the same type.
When to seek professional help
If you’re unable to determine the correct battery type, or the fob still doesn’t work after replacement, consult a Honda dealer or certified automotive locksmith. Some fobs may require re-synchronization or a new battery contact replacement, and professionals can ensure the device remains water resistant and properly sealed.
Summary
Across most Honda models, the key fob battery is a 3V lithium coin cell, with CR2032 being by far the most common modern choice. Some older remotes use CR2025. Always verify the exact type by inspecting the fob or checking the owner’s manual, and replace with the correct size following safe steps. When in doubt, a dealership or locksmith can help identify the right battery and replace it correctly.