How to Replace the Key Fob Battery in a Tesla Model Y

1. Place the key fob button side down on a soft surface and release the bottom cover with a small flat-bladed tool.
2. Lift the old battery away from the retaining clips.
3. Insert a new CR2032 battery with the '+' side facing up, without touching its flat surfaces.
4. Hold the bottom cover at an angle, align its tabs with the slots on the key fob, and press it until it snaps into place.
5. Test the key fob by unlocking and locking Model Y.

• Battery lasts up to one year; a message shows on the touchscreen when it is low.
• Wipe the battery clean before fitting; finger marks on the flat surfaces can reduce battery life.
• Coin cell battery is a chemical burn hazard if swallowed; keep new and used batteries away from children.

Source: 2026 Tesla Model Y owner's manual, PDF pages 28, 29. 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.