Lincoln Nautilus key fob battery
5 of the 8 model years listed for the Lincoln Nautilus have a proven battery. The most common answer is CR2450. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.
- 2019-2022Smart key
CR2450
FCC ID M3N-A2C940780 / M3N-A2C931426Two sites agree: uhs-hardware.com and energizer.com (checked Nov 1, 2026)
Find CR2450 on Amazon - 2023Smart key
CR2450
FCC ID M3N-A3C054339Two sites agree: americankeysupply.com and bestkeysupply.com (checked Nov 2, 2026)
Find CR2450 on Amazon - 2024Smart key
Not confirmed yet
- 2025-2026Smart key
Not confirmed yet
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.
- The gap left by the metal key usually has a pry point. A slow twist with a thin flat tool (tape on the tip saves the plastic) opens the two halves.
- 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.
Lincoln fobs usually have a release for the emergency key, and the case opens at the slot it leaves.
A CR2450 is 24.5 mm across and 5.0 mm thick, much fatter than a CR2032. A thinner cell will rattle and lose contact, so buy the exact size.
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.