How to Replace the Key Fob Battery in a Acura RLX

1. Remove the built-in key from the keyless access remote.
2. Pry off the upper half of the cover at the edge using 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 in a cloth to prevent scratching the remote.
• Replace the battery if the indicator does not come on when a button is pressed.

Source: 2020 Acura RLX owner's manual, PDF page 478. 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.