How to Replace the Key Fob Battery in a Hyundai Santa Fe Hybrid

1. Insert a slim tool into the slot (1) and gently open the rear cover of the smart key.
2. Remove the old battery.
3. Insert a new battery, making sure its position is correct.
4. Reinstall the rear cover of the smart key.

• A "Low key battery" message in the cluster means the smart key's internal battery is low.
• An improperly positioned battery may discharge and cause smart key failure.
• The key contains a lithium button battery; keep it away from children, as swallowing can cause severe or fatal injury.

Source: 2026 Hyundai Santa Fe Hybrid owner's manual, PDF pages 203, 174. 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.