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Kia Optima Key Fob Battery Replacement Guide
How to change a weak or dead battery in the key fob for a fourth generation 2016 to 2020 Kia Optima sedan.

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Paul B. Michaels
Author & Photographer
Auto Mechanic Since 1989

2019 Optima Key Fob
Back Side of Fob
Chrome Release Button
This automotive maintenance tutorial was specifically written to assist owners of the 4th generation (2016, 2017, 2018, 2019 and 2020 model years) Kia Optima sedan in changing a weak a dead battery in the standard key fob remote control for the keyless entry system. The procedure should be similar or the same for the EX and SX trim levels with the smart key fob.

Owners of other Kia, Hyundai or Genesis vehicles such as the Niro, Sportage, Sedona, Telluride, Sorento, Rio, Forte, Soul, K900, Cadenza, K5, Stinger, Tucson, Santa Fe, Kona, Palisade, Elantra, Sonata, Accent, Veloster, Ioniq, Nexo, Venue, G70, G80 and G90 may also find these DIY instructions to be helpful.

The compatible replacement coin cell (also known as a "button" or "watch") battery is part number CR2032 which is available from various manufacturers such as Panasonic, Sony, Duracell, Energizer and Maxell.

The tools needed to access and replace the battery include a plastic pry bar tool and a small flat head screwdriver such as from a jeweler's screwdriver set.

I recommend first detaching the key ring and your other keys from the fob to make the entire process easier.

Locate the chrome silver button on the top left of the fob situated above the "Lock" button.


Swing Out Ignition Key
Notch / Slot - Left Side
Pry Off Battery Cover
Press the button to release the swing out "switchblade" style metal ignition key.

Insert the plastic pry bar tool into the empty slot on the left side of the fob where the ignition key used to reside.

Gently pry off the plastic cover on the back side of the fob.

Old Battery Exposed
Battery In Socket
Gently Pry Out Battery
Set the rear cover aside in a safe place.

Use a small flat head screwdriver to very carefully pry the old battery out of the socket.

Try to avoid bending the metal electrical contacts or scratching the green circuit board.

Old Battery Removed
Panasonic CR2032 3V
Empty Battery Socket
The OEM (original equipment manufacturer) battery in the fob for this 2019 Optima LX FE was a Panasonic CR2032 3 volt lithium coin cell.
Pop In New Battery
New Battery Installed
Line Up Rear Cover
Orientate the new battery with the "+" positive side facing up towards you and the "-" negative side facing down into the socket towards the green circuit board.

Gently insert the new battery into the holder.

The plastic retaining clips and metal electrical contacts should "click" securely over the top of the new battery.

Make sure the new battery is fully seated in the socket.

Line up the back cover over the rear of the fob.

Snap On Back Cover
Key Fob Re-Assembled
Test New Fob Battery
Gently pop the plastic cover back into place on the back side of the fob.

Make sure the cover is flush with the rest of the fob at every edge.

To test the new battery, stand near your car and press the "Unlock" or "Lock" button.

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

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

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

Please check out all of my 2016-2020 Kia Optima 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!
(Note: I am not a registered charity. Donations are not tax deductible.)


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