How to Replace the Key Fob Battery in a MINI Hardtop 4 Door

1. Press and hold the button, then pull the cover out of the locking mechanism from the bottom end.
2. Pull the cover out of the upper locking mechanism and remove it.
3. Turn a coin counterclockwise to open the battery compartment lid.
4. Remove the old battery from the battery housing.
5. Insert a CR2032 3V battery with the positive terminal facing up.
6. Turn the coin clockwise to close the lid until the arrowheads point toward each other.
7. Refit the cover in reverse order until it audibly engages at the top and bottom.

• Replace with a battery of the same voltage, size and specification.
• If the key battery is discharged, the key is not detected, but emergency detection can turn on drive-ready state.

Source: 2025 MINI Hardtop 4 Door owner's manual, PDF pages 71, 72. 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.