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Ford Flex Key Fob Battery Replacement Guide
How to change the battery in the smart key fob remote for a 2013 to 2019 Ford Flex including the part number.

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2019 Flex Smart Key Fob
Back Side of Fob
This automotive maintenance tutorial was specifically written to assist owners of the refreshed first generation (2013, 2014, 2015, 2016, 2017, 2018 & 2019) Ford Flex crossover SUV equipped with the smart or "intelligent" key fob remote control for the keyless entry and push button start systems in changing a weak or dead battery.

Owners of other Ford or Lincoln vehicle such as the Explorer, Fiesta, Focus, Fusion, C-Max, Mustang, Taurus, EcoSport, Escape, Edge, Expedition, Transit Connect, F-150, Ranger, MKZ, MKC, Navigator, MKX and Continental may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery part number is CR2032.

The only tool needed to open the fob to access and replace the battery is a flathead screwdriver or a plastic pry bar tool.

(If you have an earlier 2009, 2010, 2011 or 2012 model year Flex with the standard key fob with a metal ignition key, please take a look at my Ford F-150 Key Fob Battery Replacement Guide.)


Key Release Switch
Slide Release Switch
Turn over the fob and locate the release switch.

Slide over the switch to release the backup / emergency metal ignition key.

Pull Out Backup Key
Emergency / Backup Key
Pull the key straight out of the slot.

Set the key aside in a safe place.

Insert Flathead Screwdriver
Pry Apart Two Halves
Insert a flathead screwdriver or a plastic pry bar tool in to the notch where the metal key used to reside.

Gently twist the screwdriver to pry apart the two halves of the fob.

You may need to use the plastic pry bar tool to loosen all along the edges of the fob.

Try to avoid using excessive force. The fob should separate relatively easily.

Rear Cover Removed
Pry Out Old Battery
Pull apart the two halves of the fob.

The battery socket is located in the back cover of the fob.

Gently pry out the old battery.


Old Battery Removed
Panasonic CR 2032 3V

The original "OEM" battery in the fob was a Panasonic CR2032 3 volt coin cell.

Battery Holder / Socket
Install New Battery
Orientate the new battery with the "+" positive side facing down and the "-" negative side facing up towards you.

If you can re-use some of the old dielectric grease on the old battery, apply some of the dielectric grease to the negative side of the new battery.

New Battery Installed
Line Up Back Cover
Push the new battery into the socket with the negative side facing up towards you.

Line up the two halves of the fob.

Snap Together Two Halves
Slide In Metal Key
Gently pop together the two halves of the fob.

Double check that the rear cover is flush with the front part of the fob at every edge.

Push the backup metal ignition key back into its slot.

Backup Key Replaced
Test New Fob Battery
The ignition key should "click" securely into place.

To test the new battery, stand near your vehicle and press the "Unlock" and "Lock" buttons.

If the new battery is working properly, you should see the parking lights flash and also hear the door locks opening or closing.

(The fob should not need to be reprogrammed. Just changing the battery does not clear the original programming.)

Be sure to record the battery change in your vehicle's service records.

Please check out all of my Ford Flex DIY Repair & Maintenance Guides.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
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