Most Honda Accord key fobs use a CR2032 3-volt lithium coin cell.
Common battery type
The CR2032 is the standard battery for most recent Accord key fobs, widely available at electronics stores and supermarkets. It measures about 20 mm in diameter and 3.2 mm thick, and it delivers a stable 3V power supply for remote functions.
- CR2032 — 3V lithium coin cell, standard size used in most recent Accord fobs.
- CR2025 — a thinner 3V coin cell found in some older or regional variants; verify by inspecting the fob or manual.
- Always confirm the exact size by checking the back of the current battery or the owner’s manual for your specific model/year.
Note: Battery sizes can vary by year and market. When in doubt, verify the exact specification for your fob before purchasing a replacement.
Model-year variations
While CR2032 is the default for many newer Accord key fobs, certain older generations or regional variants may use a different coin cell. If you are unsure, inspect the existing battery or consult the owner’s manual or a Honda dealer to confirm the correct size.
How to replace the battery
Replacing the battery is a straightforward DIY task. Here are the general steps that apply to most Honda Accord fobs:
- Remove the mechanical key from the fob to access the housing.
- Gently pry apart the two halves of the fob with a small flathead screwdriver or a similar tool.
- Note the battery’s polarity, then remove the old battery.
- Insert a new CR2032 (3V) with the correct orientation (+ side up, unless the fob indicates otherwise).
- Snap the halves back together and reinsert the mechanical key.
- Test the fob by locking/unlocking the doors and starting the car if your model supports it.
If your fob uses a non-standard battery or you encounter any difficulty, contact a Honda dealer or a qualified automotive locksmith for assistance.
Where to buy
CR2032 coin cells are widely available at supermarkets, electronics stores, auto parts shops, and online retailers. Bring the old battery or the fob itself to ensure you purchase the correct size.
Tip: It’s practical to keep a spare CR2032 on hand for future replacements, and store batteries in a cool, dry place away from metal objects that could cause short circuits.
Summary
In short, the Honda Accord key fob most commonly uses a CR2032 3V lithium coin cell. Always verify the exact size by inspecting the battery inside your fob or consulting the owner's manual, especially for older or regional models. Replacement is quick and can typically be done at home with a small tool and a fresh battery.