The 2018 Honda Accord key fob uses a CR2032 3-volt coin cell battery.
This article explains how to confirm the battery type, locate and replace it, and where to buy replacements. It covers standard battery sizes for Honda remotes, the replacement steps, and practical tips to keep your fob functioning reliably.
Battery type and confirmation
For the 2018 Accord, the key fob is designed around a single CR2032 battery. If you’re unsure, you can verify by opening the fob or checking the owner's manual. While CR2032 is the standard, some markets historically used different sizes, so it’s good to confirm before buying a spare.
Common coin cell sizes used in Honda remotes include:
- CR2032 — 3V, 20 mm diameter, 3.2 mm thick (the typical choice for the 2018 Accord).
- CR2025 — 3V, 20 mm diameter, 2.5 mm thick (occasionally used in some models or markets).
- Note: If your fob feels unusually thick or you’re unsure, check the back cover or your vehicle documentation to confirm the exact size before purchasing.
In most cases, the CR2032 is the correct and recommended battery for the 2018 Accord key fob. If you’re replacing a battery that looks different, avoid forcing a non-compatible size into the fob.
How to replace the battery
To replace the battery, you’ll need a CR2032 coin cell and a small tool or coin to pop open the fob. The process is straightforward but requires gentle handling to avoid damaging the shell or the electronic contacts.
- Hold the fob with the Honda logo facing upward and locate the seam along the edge of the back cover.
- Use a flat tool or a coin to twist open the back cover and remove it carefully.
- Take note of the battery orientation, with the plus (+) side facing up.
- Remove the old battery and dispose of it properly at a battery recycling point.
- Insert the new CR2032 with the plus side facing up, ensuring it sits flush.
- Reattach the back cover until it snaps securely into place.
- Test the fob by locking/unlocking the doors from a short distance to confirm it’s working correctly.
If the fob still doesn’t respond after replacement, check that the battery contacts are clean and making good contact. If issues persist, the fob may require professional inspection or replacement.
Where to buy and cost
Batteries for the 2018 Honda Accord key fob are widely available at several kinds of retailers. Here’s where to look and what to expect for pricing.
- Auto parts stores (e.g., AutoZone, Advance Auto Parts, O'Reilly)
- Big-box retailers and supermarkets (e.g., Walmart, Target) with electronics sections
- Online retailers (e.g., Amazon, dedicated battery sites)
- Electronics stores and some pharmacies may stock CR2032 batteries
Prices typically range from about $2 to $6 per battery, depending on brand and whether you buy in single packs or value packs. Brand name CR2032 batteries tend to cost a little more, but compatibility is the key factor. Always verify the size (CR2032) before checkout.
Battery safety and disposal
Handle new and spent batteries with care. Do not puncture or short-circuit the coin cell, and dispose of spent batteries at designated recycling locations in your area to protect the environment and avoid contamination.
Summary
The 2018 Honda Accord key fob typically uses a CR2032 3-volt coin cell. Replacing it involves prying off the back cover, swapping in a fresh CR2032 with the correct orientation, and reassembling the fob. Replacements are readily available at auto parts stores, electronics retailers, and online, usually for a few dollars. After replacement, test the fob to ensure reliable operation, and recycle the old battery properly.