Most Honda key fobs use a CR2032 3-volt lithium coin battery; however, some older models or specialty remotes may use CR2025 or CR1616. Check your owner’s manual or inspect the current battery to confirm the exact size before buying a replacement.
Common battery sizes for Honda key fobs
Model year and remote design drive the exact size, but the following sizes cover the majority of Honda remotes in circulation today.
- CR2032 — 3V lithium coin cell; the most common size for modern Honda remotes.
- CR2025 — 3V lithium coin cell; used by some earlier or smaller fobs.
- CR1616 — 3V lithium coin cell; appears in a minority of older or compact keys.
In practice, the CR2032 is the default for most current Hondas. If your fob looks different or the battery is unusually thin, check the label on the battery or refer to your vehicle’s manual to confirm the exact size.
How to identify the exact battery for your model
Use these steps to confirm the precise cell size for your particular Honda key fob.
- Find your vehicle’s manual or the Honda support page for your model/year to see the recommended replacement battery size.
- Remove the fob from your keys and locate the battery compartment on the back.
- Carefully pry open the back cover if there is no screw, using a small flat tool to avoid damaging the plastic.
- Inspect the battery or its packaging for the model number (CR2032, CR2025, CR1616, etc.). If it’s unreadable, measure the diameter and thickness to distinguish among common sizes (20 mm diameter plus 3.2 mm or 2.5 mm thickness).
- If you cannot determine the size, take the fob to a dealer or an auto parts store for a quick match.
Once you know the correct size, you can proceed with replacement using the proper coin cell and orientation.
How to replace the battery safely
Follow these steps to replace the battery without damaging the fob or losing programming.
- Gather the right replacement battery (e.g., CR2032) and a small screwdriver or prying tool if needed.
- Power down and remove the fob’s shell by gently prying apart along the seam; some models use a screw—if so, remove the screw first.
- Remove the old battery, noting its orientation (which side faces up).
- Insert the new battery with the correct polarity (+ side up, typically facing you).
- Reassemble the fob, ensuring the cover snaps or screws back securely.
- Test the remote by pressing the buttons to confirm it works; if not, recheck battery orientation or consider a reset if prompted by the manual.
A note: some Honda remotes require re-linking or reprogramming after battery replacement; consult your owner's manual if the fob stops recognizing the car after replacement.
Summary
For most modern Honda key fobs, the replacement battery is a CR2032 3-volt lithium coin cell. Some older designs may use CR2025 or CR1616. Verify the exact size by checking the battery itself, your vehicle’s manual, or with a dealership/auto parts store, and follow careful replacement steps to keep your key fob functioning reliably.