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

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 the new CR2354 battery with the '+' side facing up, without touching its flat surfaces.
4. Slide the battery against the spring on the positive contact rather than forcing it down vertically.
5. Hold the bottom cover at an angle, align its tabs with the slots, and press it on until it snaps into place.
6. Test the key fob by unlocking and locking Model X.

• The battery lasts up to one year, and a message shows on the touchscreen when it is low.
• Key fob batteries are a chemical burn hazard; keep new and used batteries away from children.
• CR2354 batteries can be bought from any retailer that sells batteries.

Source: 2026 Tesla Model X owner's manual, PDF pages 30, 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.