The 2018 Honda Odyssey key fob typically uses a CR2032 3-volt lithium coin battery.
This article explains the standard battery type, how to replace it, and practical tips to keep your remote functioning smoothly. It covers what to look for, where to buy, and the correct steps to install a new battery.
Battery type and compatibility
For most 2018 Odyssey key fobs, the replacement battery is a CR2032 3V coin cell. This size is widely used across Honda remotes from that era. If you’re unsure, confirm by inspecting the current battery in your fob or by consulting the owner’s manual or a Honda dealer.
Possible variations to watch for
While CR2032 is the standard for this model year, a minority of regional or trim-specific fobs could use a different coin cell such as CR2025. If the battery you remove appears noticeably thinner or thicker, verify the correct size before purchasing a replacement.
Replacing the battery
To replace the battery in a 2018 Odyssey key fob, use the steps below. Have a new CR2032 battery ready before you begin.
- Remove the emergency key blade if your fob includes one, and locate the seam or slot where the fob halves meet.
- Gently pry apart the fob to access the battery compartment.
- Note the orientation of the old battery (which side is up) and remove it carefully.
- Insert the new CR2032 battery with the correct polarity.
- Reassemble the fob halves and reinsert the emergency key blade if applicable.
- Test the remote by pressing the buttons from a short distance to ensure proper operation.
After replacing the battery, reassemble the fob and test it to confirm the replacement was successful. If the remote doesn’t respond, double-check the battery orientation and ensure the contacts are clean and intact.
Additional tips
Buy a reputable brand and keep spare CR2032 batteries on hand. When storing the fob, avoid extreme temperatures and moisture, which can affect battery performance. If you continue to experience issues after replacement, a dealership or automotive locksmith can diagnose potential fob or receiver problems in the vehicle.
Summary
The 2018 Honda Odyssey key fob uses a CR2032 3V lithium coin battery. Replace it by opening the fob, swapping the old cell for a new CR2032 with correct polarity, and testing the remote. If you have a variant that uses a different coin cell, verify the exact size before purchasing. Proper disposal of old batteries and precautionary handling are recommended.
What size battery does my 2018 Honda key fob take?
And the battery. You need to replace in here is the 2032. So once you have your new battery ready to go all you really need to do this job is a simple flat screwdriver.
Can I use CR2032 instead of CR2025 in a key fob?
Fit and Functionality:
However, if it's too tight or prevents the case from closing properly, it might be better to stick with the CR2025 to avoid damaging the key fob. In summary, you can use a CR2032 instead of a CR2025 as long as it fits properly in the battery compartment of your car key.
What type of battery does a 2018 Honda Odyssey take?
The OPTIMA DH6 YELLOWTOP, which is a direct-fit replacement for the 2018 and newer Honda Odysseys, is a 72 Ah battery and weighs in at a hefty 54 pounds.
What battery does a 2018 Honda Odyssey key fob take?
The first thing we're going to do in order to change the battery is remove the emergency key that's in the bottom of the key fob.