How to Replace the Key Fob Battery in a Honda Odyssey

1. Remove the built-in key from the remote.
2. With the buttons facing down, pry the slot with the key grip to remove the upper half of the cover.
3. Pry the battery out by its edge with a flat-tip screwdriver.
4. Install the new battery with the correct polarity.

• Battery type: CR2032.
• Wrap the key grip and screwdriver in a cloth to prevent scratching the remote.
• Replace the battery if the indicator does not come on when a button is pressed.

Source: 2026 Honda Odyssey owner's manual, PDF page 563. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.