How to Replace the Key Fob Battery in a Buick Envista

1. Press the button on the bottom of the remote key and remove the key.
2. Insert a flat, thin object and take off the back cover.
3. Lift the battery out with a flat object.

• The pages given end at step 3; the remaining steps for installing the new battery and reassembly are not included.
• Do not touch the circuitry, and use the correct battery type.
• If the battery is low, hold the remote key in the remote key pocket with the buttons facing the front of the vehicle to start the vehicle.

Source: 2026 Buick Envista owner's manual, PDF pages 16, 15. 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.