Ford Mustang Mach-E key fob battery
3 of the 4 model years listed for the Ford Mustang Mach-E 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.
- 2021-2023Smart key
CR2450
FCC ID M3N-A2C931423Two sites agree: uhs-hardware.com and energizer.com (checked Nov 1, 2026)
Find CR2450 on Amazon - 2024Smart key
Not confirmed yet
Changing the battery
Smart key (push-button start)
- Start by freeing the hidden metal key: there is a latch or slide on the case, and the blade comes out once it moves.
- 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.
- Pop the old battery out with a toothpick or plastic pick, not a metal blade, and seat the new one with the + side matching the old one.
- Close the case until it clicks all the way round, put the metal key back, then try the buttons and a push-button start.
Ford intelligent access fobs usually have a release for the emergency key. The key blade itself fits the pry slot.
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.
If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.