How to Replace the Key Fob Battery in a Acura NSX

1. Remove the built-in key from the keyless access remote.
2. Pry off the upper half of the cover carefully at the edge with a coin.
3. Take care not to lose the buttons when removing the cover.
4. Install the new battery with the correct polarity.

• Battery type: CR2032.
• Wrap the coin with a cloth to prevent scratching the keyless access remote.
• Replace the battery if the indicator does not come on when the button is pressed.

Source: 2020 Acura NSX owner's manual, PDF page 420. 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.