How to Replace the Key Fob Battery in a Cadillac XT4

1. Press the button on the side of the remote key near the bottom and pull out the mechanical key.
2. Use the mechanical key blade in the slot to remove the battery cover by hand.
3. Pull on the tab to access the battery and remove the old battery without using a metal object.
4. Insert the new CR2450 lithium or equivalent battery with the positive side facing up.
5. Place the seal back into the groove around the battery compartment.
6. Snap the battery cover back onto the remote key and reinsert the mechanical key.

• Replace the battery when the Driver Information Center displays REPLACE BATTERY IN REMOTE KEY.
• Do not touch the circuitry on the remote key, since static could damage it.
• Reassemble the key properly so liquids cannot enter the housing.

Source: 2025 Cadillac XT4 owner's manual, PDF pages 13, 12. 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.