How to Replace the Key Fob Battery in a Hyundai IONIQ 5

1. Insert a slim tool into the slot (1) on the smart key.
2. Gently pry open the rear cover of the smart key.
3. Take out the old battery.
4. Insert the new CR2450 battery, making sure the battery position is correct.
5. Reinstall the rear cover of the smart key.

• Battery Type: CR2450
• An improperly positioned battery may discharge the battery, causing smart key failure.
• The product contains a button battery; keep batteries out of reach of children.

Source: 2026 Hyundai IONIQ 5 owner's manual, PDF pages 229, 230. 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.