How to Replace the Key Fob Battery in a Ford Flex

1. Remove the key blade from the remote control (Intelligent Access Key).
2. Twist a thin coin under the tab behind the key blade head to remove the battery cover.
3. Remove the old battery.
4. Insert a new battery with the + facing downward and press it fully into the housing.
5. Put the battery cover back on the remote control and reinstall the key blade.

• The remote uses one coin-type battery.
• Do not use the key blade to pry the cover off, or you could damage it.
• For the integrated keyhead transmitter, twist a thin coin in the slot near the key ring and insert the battery with + facing upward.

Source: 2019 Ford Flex owner's manual, PDF pages 57, 58. 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.