Hyundai Ioniq 5 key fob battery
2 of the 5 model years listed for the Hyundai Ioniq 5 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.
- 2022Smart key
Not confirmed yet
- 2022Smart key
Not confirmed yet
- 2023Smart key
Not confirmed yet
- 2023Smart key
Not confirmed yet
- 2024Smart key
Not confirmed yet
- 2024Smart key
Not confirmed yet
- 2025-2026Smart key
CR2450
FCC ID TQ8-FOB-4FA2U44Two sites agree: bestkeysupply.com and transponderisland.com (checked Nov 1, 2026)
Find CR2450 on Amazon
Changing the battery
Smart key (push-button start)
- Most push-button fobs hide a metal backup key. Press or slide its catch and draw the key out first.
- Look inside the empty key slot for a notch. Put the tip of the metal key or a small flat screwdriver wrapped in tape there and twist gently until the shell splits.
- 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.
- Snap the halves back together, slide the metal key home, and press each button, then try the start button from the driver's seat.
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.