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

Steps from the 2026 Hyundai Santa Fe owner's manual (Smart key).

Insert a slim tool into the slot (1) and gently open the rear cover of the smart key.
Remove the old battery.
Insert a new CR2450 battery, making sure its position is correct.
Reinstall the rear cover of the smart key.

Battery type: CR2450.
An improperly positioned battery may discharge, causing smart key failure.
A "Low key battery" message may appear when the Engine Start/Stop button is pressed to OFF.

Source: 2026 Hyundai Santa Fe owner's manual, PDF page 177. 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.

Confirm with your own manual, dipstick or door-jamb label.
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