The majority of Honda Accord key fobs use a 3-volt coin cell battery, typically CR2032 or CR2025, with the exact type depending on the model year and key design. Checking the existing battery or the owner's manual will confirm the correct replacement.
Identifying the correct battery for your Accord
Key fob designs evolve over time. While CR2032 is the most common in modern Accords, some trims or older generations may use CR2025. The safest approach is to inspect the current battery or consult Honda's official guidance for your specific year.
Common battery types you may encounter
For most current Honda Accord key fobs, the replacement will be one of these two 3V coin cells. The diameter is 20 millimeters, while the thickness determines whether it is 2.5 mm (CR2025) or 3.2 mm (CR2032).
- CR2032: Widely used in newer Accords and many remote keys; 3V coin cell with 20 mm diameter and 3.2 mm thickness.
- CR2025: Used in some models and trims; 3V coin cell with 20 mm diameter and 2.5 mm thickness.
To avoid a mismatch, verify the exact type by removing the old battery and reading its imprint, or by consulting the fob's manual or a dealer.
How to replace the key battery
Before you start, ensure you have the correct replacement battery (CR2032 or CR2025) and a small, flat tool if your fob requires prying open. Replacement steps are similar across most Honda fobs, but designs may vary slightly.
- Open the key fob with care: Use a thin flat tool or a coin to pry apart the two halves at the seam, or locate the release mechanism if your model uses one.
- Remove and identify the battery: Note the battery orientation and whether the positive (+) side faces up. If the old battery is stuck, gently lift it from the contact points.
- Install the new battery: Place the CR2032 or CR2025 in the correct orientation and reseal the fob by snapping the halves back together, ensuring a snug fit.
- Test the fob functions: After reassembly, press Lock, Unlock, and Trunk from a short distance to confirm the replacement was successful.
If the fob still doesn’t work after replacement or behaves oddly, there may be a deeper issue with the fob’s electronics or the car’s receiver. A dealer or automotive locksmith can diagnose and reprogram if necessary.
Notes about emergency keys and compatibility
Many Honda Accord fobs include a hidden mechanical key for emergencies. Replacing the battery will not affect this feature, but you may need to access the mechanical key by sliding out or releasing it from the fob, depending on the design.
Summary
In most modern Honda Accords, the key fob battery is a 3V coin cell, most often CR2032 or CR2025. To ensure a correct replacement, check the current battery or the owner's manual, and follow proper replacement steps. If you’re unsure, a dealer or locksmith can confirm the exact type for your year and model and replace it for you.