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Hyundai Tucson 12V Automotive Battery Replacement Guide
How to change a dead or weak 12 volt car battery in a 3rd generation 2016, 2017 and 2018 Hyundai Tucson SUV

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2018 Tucson Nu 2.0L GDI I4
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Engine Air Intake Assembly
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Pry Up Center of Fastener
This automotive maintenance tutorial was specifically written to assist owners of the third generation (2016, 2017, 2018 plus the updated 2019 and 2020 model years) Hyundai Tucson SUV in changing a dead or weak 12 volt car battery for the Nu 2.0 liter GDI inline four cylinder engine.

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

The OEM 12V battery is a Rocket CMF68L-DIN (or CMF68L DIN) which is a "Group Size" 124F.

A few other compatible replacement 124F batteries with their part numbers are as follows: Hyundai 37110-24001U, EverStart MAXX-124R (Walmart), AutoCraft Gold 24FH, Napa Legend BAT 75124R and ProStart # 24FH700PS.

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



 
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Pull Out Plastic Pop Rivet
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Release 2nd Pop Rivet
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Two Fasteners Removed
The first two steps are to open the hood and then move to the right (driver) side of the engine bay.

The 12V car battery is located under the black plastic engine air intake assembly that is attached to the front of the engine bay and leads to the air filter box.

Locate the two round black plastic pop rivet fasteners on the front edge of the air intake assembly.

Gently pry up the smaller center part of each fastener to unlock them.

Then pry out the base of the fastener.

Set the two pop rivets aside in a safe place.

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Lift Up Front of Air Intake
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Air Intake Removed
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12V Battery Exposed
Carefully lift the front of the air intake assembly and pull the rear edge out of the opening in the air box.

Set the air intake aside in a safe place.

Once the air intake assembly is out of the way, you'll be able to see the old 12V battery.

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Loosen Negative Terminal
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Pull Off Negative Terminal
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Cover & Tuck Away
Loosen the negative terminal by turning the nut in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet or a 10mm wrench.

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

Wrap the negative terminal in a small towel and tuck it away on the right side of the battery to help prevent accidental electrical contact.

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12mm Socket & Extension Bar
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Battery Hold Down Clamp
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Loosen Counterclockwise
Attach the 12mm socket to the long extension bar and the 3/8" drive ratchet.

Locate the battery hold down bar and the single bolt that holds it in place at the front bottom edge of the 12 volt battery.

Loosen the 12mm bolt by turning it in the counterclockwise direction.

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Remove Hold Down Bar
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Open Plastic Cover
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Loosen Positive Terminal
Lift out the battery hold down clamp and set it aside in a safe place.

There should be a plastic retaining washer attached to the 12mm bolt to keep it safely attached to the hold down clamp.

Push in the release tab on the black plastic cover on the positive terminal.

Swing open the plastic cover to reveal the positive "+" terminal.

Loosen the nut on the positive terminal by turning it in the counterclockwise direction a few turns.

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Pull Off Positive Terminal
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Lift Out Old Battery
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Remove Heat Shield Box
Pull the positive terminal off the "+" battery post.

Close the plastic cover over the positive terminal and tuck it away on the left side of the battery.

Pull the heat shield cover off the old battery and set it aside.

Raise the two handles on the top of the old battery.

Carefully lift the old battery out of the engine bay and set it on the ground.

Avoid tipping over or dropping the old battery to prevent from having acid leak out.



 

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Old 12V Battery Removed
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Rocket CMF68L-DIN
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Clean Off Battery Tray
The OEM battery was a Rocket brand part number CMF68L-DIN (or CMF68L DIN).

Be sure to bring the old battery with you to Walmart or the auto parts store to prevent from having to pay a "core", "recycling" or "disposal" fee.

Clean off any debris on the plastic battery tray in the engine bay so that the new battery will rest evenly on it.

If you can wait a few days for delivery, I recommend buying the genuine OEM Hyundai / Kia # 37110-24001U 12V battery.

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Lower In New Battery
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Replace Heat Shield Cover
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Push On Positive Terminal
Carefully lower the new battery into the engine bay.

The positive post should be on the left (passenger) side and the negative post should be on the right (driver) side.

Lower the heat shield cover over the new battery.

Push the positive terminal on to the "+" battery post on the left side.

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Tighten Positive Terminal
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Close Plastic Cover
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Battery Hold Down Clamp
Tighten the nut on the positive terminal by turning it in the clockwise direction with a 10mm socket and a 1/4" drive ratchet until it is snug.

Avoid over tightening the terminal nut to prevent from damaging or cracking the battery post which could cause an acid leak.

Swing the black plastic cover closed over the positive terminal.

Lower the hold down clamp down on to the front bottom edge of the new battery and the battery tray.

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Re-Insert Bolt
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Tighten Clockwise
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Push On Negative Terminal
Spin in the 12mm bolt a few turns by hand in the clockwise direction to prevent it from becoming cross threaded.

Tighten the bolt in the clockwise direction with the 12mm socket attached to a long extension bar and the 3/8" drive ratchet.

Double check that the new battery can not be moved, rocked or slid around on the battery tray.

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

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Tighten Negative Terminal
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New Battery Installed
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Line Up Air Intake
Push the negative terminal on to the "-" battery post on the right side.

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

Double check that both terminals are securely attached to the new battery.

Line up the rear of the air intake assembly with the opening in the air filter box.

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Push Down Into Place
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Re-Insert Pop Rivets
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Push Down Middle - Lock
Push the air intake assembly back down into place.

Re-insert the two pop rivets into the openings on the front edge.

Push down the center part of each fastener to lock them into place.

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Two Pop Rivets Secured
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Air Intake Replaced
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12 Volt Battery Replaced
To test the new 12V battery, start the engine, turn on the headlights and flash the high beams.

Please remember to adjust the time on the clock and program your favorite radio station presets before you start driving.

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

For more, check out all of my 2016-2018 Hyundai Tucson DIY Repair & Maintenance Guides.
 

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