How to Replace the Key Fob Battery in a Buick Regal

1. Press the button on the rear of the transmitter and pull the key out.
2. Pry off the battery cover with a finger.
3. Push on the battery and slide it toward the key blade to remove it.
4. Insert the new CR2032 or equivalent battery with the positive side facing up and push it down until held.
5. Snap the battery cover back on and reinsert the key.

• Replace the battery when the DIC displays REPLACE BATTERY IN REMOTE KEY.
• Do not touch the circuitry on the transmitter, as static could damage it.
• The battery is not rechargeable.

Source: 2020 Buick Regal owner's manual, PDF page 16. 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.