How to Replace the Key Fob Battery in a Acura MDX Sport Hybrid

1. Remove the built-in key from the remote transmitter.
2. Lightly place masking tape over the remote buttons to hold them in place, if you wish.
3. Pry off the upper half of the cover at its edge with a coin wrapped in cloth.
4. Press down on the center of the assembly and take out the battery, avoiding the parts around it.
5. Insert the new battery with the correct polarity.

• Replace the battery if the indicator does not come on when the button is pressed.
• Battery type: CR2032; replace it every three to four years to protect the integral rechargeable battery.
• Keep new and used batteries away from children because of the chemical burn hazard.

Source: 2020 Acura MDX Sport Hybrid owner's manual, PDF page 603. 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.