carfobbattery

Hyundai Ioniq 6 key fob battery

3 of the 4 model years listed for the Hyundai Ioniq 6 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.

  1. 2023-2024Smart key

    CR2450

    FCC ID NYOMBEC7FOB2208

    Two sites agree: carandtruckremotes.com and uhs-hardware.com (checked Nov 2, 2026)

    Find CR2450 on Amazon
  2. 2025Smart key

    CR2450

    FCC ID NYOMBEC7FOB2208

    Owner's manual: manua.ls and carandtruckremotes.com (checked Nov 1, 2026)

    Manual text: “Battery Type: CR2450”

    Find CR2450 on Amazon
  3. 2026Smart key

    Not confirmed yet

Changing the battery

Smart key (push-button start)

  1. Find the small release on the edge or back of the fob and hold it while you pull out the metal emergency key.
  2. Use the slot where the metal key sat. Twist, do not lever hard, and work along the seam until the halves separate.
  3. 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.
  4. Reassemble, refit the emergency key, and check that the car sees the fob when you press start.

Hyundai smart keys usually have a button that releases the mechanical key; a flat tool in the gap then opens the case.

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.

Other Hyundai models