Polestar Polestar 4 key fob battery
Every model year listed for the Polestar Polestar 4 has 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.
- 2025Smart key
CR2450
Owner's manual: polestar.com (checked Nov 1, 2026)
Manual text: “The fob requires a flat CR2450 disc or button battery.”
Find CR2450 on Amazon - 2026Smart key
CR2450
Owner's manual: polestar.com (checked Nov 2, 2026)
Manual text: “The fob requires a flat CR2450K disc or button battery.”
Find CR2450 on Amazon
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.
- Use the slot where the metal key sat. Twist, do not lever hard, and work along the seam until the halves separate.
- Before you take the old cell out, look at its face. Put the new cell in with the same side showing, and avoid touching both faces at once.
- Reassemble, refit the emergency key, and check that the car sees the fob when you press start.
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.