Tesla Model X key fob battery
Every model year listed for the Tesla Model X has a proven battery. The most common answer is CR2354. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2016-2020Smart key
CR2354
Owner's manual: service.tesla.com and static.nhtsa.gov (checked Nov 1, 2026)
Manual text: “Insert the new battery (type CR2354)”
Find CR2354 on Amazon - 2021Smart key
CR2354
Owner's manual: service.tesla.com (checked Nov 1, 2026)
Manual text: “insert the new battery (type CR2354)”
Find CR2354 on Amazon - 2022-2026Smart key
CR2354
Owner's manual: service.tesla.com and tesla.com (checked Nov 2, 2026)
Manual text: “insert the new battery (type CR2354) with the '+' side facing up”
Find CR2354 on Amazon
Changing the battery
Smart key (push-button start)
- Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- Note which side of the old coin cell faces up (usually the side with the writing), lift it out with a plastic tool, and press the new one in the same way.
- Reassemble, refit the emergency key, and check that the car sees the fob when you press start.
Buy the exact size printed on the old cell (CR2354). The first two digits are the width in millimetres and the last two are the thickness in tenths of a millimetre.
Keep spare coin cells away from small children. A swallowed coin cell can burn the throat within hours; if it happens, go to an emergency room at once.