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 OEM battery is a "Group Size" 94R (also known as H7) and the Kia / Hyundai part number is AGM70L-DIN.

Two compatible replacement aftermarket batteries with their part numbers are as follows: ACDelco 94RAGM and the EverStart Platinum AGM H7 (at Walmart).

The tools needed to complete this procedure include a 10mm socket with a 1/4" drive ratchet, a 12mm socket with a long extension bar and a 3/8" drive ratchet.

The first two steps are to open the hood and then move to the right (driver) side of the engine bay.

Locate the two black metal bolts that secure the front edge of the air intake assembly to the radiator cover at the front of the engine bay.

Lift the front of the air intake assembly off the radiator cover and then pull the rear of the intake out of the opening in engine air filter box.

Once the air intake is out of the way, you'll be able to access the old 12 volt car battery.

Attach the 12mm socket to a long extension bar and the 3/8" drive ratchet.

Loosen the single bolt that secures the hold down bar in place by turning it in the counterclockwise direction with the 12mm socket, a long extension bar and the 3/8" drive ratchet.

Set the bolt and hold down clamp aside in a safe place.

Pull the black plastic cover off the "-" negative terminal on the right (driver) side of the old battery.

Loosen the nut on the negative terminal by rotating it a few turns in the counterclockwise direction with a 10mm socket and a 1/4" drive ratchet.

You don't have to remove the terminal nut. Just loosen it enough that you will be able to pull the terminal off the battery post.

Lift the negative terminal off the "-" battery post.

Loosen the terminal nut a few turns in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet.

Pull the positive terminal off the "+" battery post.

Avoid making contact with the battery posts!

Tuck the positive terminal away on the left side of the battery to help prevent accidental electrical contact.

Lift the heat shield cover off the old battery.

Set it aside for re-installation on the new battery later on.

Gently slide the old battery forwards towards yourself to remove the ledge on the bottom rear of the battery from the retaining lip on the rear of the battery tray.

Raise the two plastic handles on the old battery.

Avoid touching the battery posts!

Gently set the old battery on the ground. Try to avoid dropping or tipping over the old battery to prevent from having acid leak out.

The OEM battery in this 2019 Optima LX FE was a Solite brand part number AGM70L-DIN (Group Size 94R / H7).

Two compatible replacement aftermarket batteries are the ACDelco 94RAGM and the EverStart Platinum AGM H7 (at Walmart).

Orientate the new battery with the positive "+" post on the left (passenger) side and the negative "-" post on the right (driver) side.

Carefully lower the new battery down into the engine bay and on to the tray.

Do not touch the battery posts to avoid being electrocuted!

Make sure that the plastic ledge on the bottom rear of the new battery slides securely under the plastic retaining lip on the rear edge of the battery tray.

Re-install the heat shield cover.

Lower the hold down clamp to the front bottom of the battery tray.

Spin in the bolt a few turns by hand in the clockwise direction to help prevent it from becoming cross threaded.

Carefully try to move, rock or slide the new battery on the tray.

If the new battery can be moved, tighten the bolt on the hold down bar an extra turn or two.

Push the positive terminal over the "+" battery post.

Tighten the terminal nut in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until it is snug.

Try to avoid over tightening the terminal nut to prevent from cracking the battery post.

Push the negative terminal on to the "-" battery post.

Tighten the nut on the negative terminal by turning it in the clockwise direction with a 10mm socket and a 1/4" drive ratchet until it is snug.

If you'd like to test the new battery before re-installing the air intake assembly, turn on the headlights for a few seconds.

Lower the front edge of the air intake to the radiator cover on the front of the engine bay.

Tighten the two bolts in the clockwise direction with the 10mm socket and a 1/4" drive ratchet until they are snug.

Double check that the air intake assembly is properly installed and fully seated into the engine air filter box.

To test the new battery, start the engine and turn on the headlights.

Please be sure to adjust the time on the clock and program your favorite radio stations before you start driving.

Remember to write down the 12V battery change in your vehicle's service records.

Please check out all of my 2016-2020 Kia Optima DIY Repair & Maintenance Guides.