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

1. Remove the built-in key from the remote.
2. Pry off the upper half carefully at the edge with a coin.
3. Press down on the center of the assembly and take out the battery.
4. Install the new CR2032 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 rechargeable battery.
• Wrap the coin in cloth to avoid scratching the transmitter, and keep batteries away from children.

Source: 2020 Acura RLX Sport Hybrid owner's manual, PDF page 532. 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.