How to Replace the Key Fob Battery in a Buick Encore GX

1. Press the button on the bottom of the remote key and slide the key out; never pull it out without pressing the button.
2. Insert a flat, thin object and remove the back cover.
3. Lift the old battery out with a flat object.

• Replace the battery soon when the Driver Information Center shows REPLACE BATTERY IN REMOTE KEY.
• Use the correct battery type and do not touch the circuitry inside the remote key.
• The pages supplied cut off after lifting out the battery; reassemble the key so it is sealed properly.

Source: 2026 Buick Encore GX owner's manual, PDF pages 15, 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.