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Hyundai Elantra 12V Automotive Battery Replacement Guide
How to change a weak or dead 12 volt car battery in a sixth generation 2017, 2018, 2019 & 2020 Hyundai Elantra.

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2018 Elantra Nu 2.0L I4
OEM 12V Car Battery
Loosen Negative Terminal
This automotive maintenance tutorial was specifically written to assist owners of the 6th generation (2017, 2018, 2019, 2020 and maybe also the 2021 model year) Hyundai Elantra sedan in changing a weak or dead 12 volt car battery for the Nu MPi 2.0 liter Atkinson cycle inline four cylinder engine. The procedure should be the same or very similar for the Kappa 1.4L I4 engine and the Gamma 1.6L turbocharged I4 engine.

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

Some of the symptoms of a weak or failing 12V battery include hard starting, slow cranking, headlights that dim when coming to a stop and / or headlights that become brighter when accelerating from a stop.

The OEM (original equipment manufacturer) battery in this 2018 Elantra with the Nu MPi 2.0L I4 engine is a "Group Size" H6 (also known as group size "48") and the part number is Solite AGM60L-DIN.

A few compatible replacement group size H6 / 48 batteries for the Nu 2.0L MPi or the Gamma 1.4L I4 engines with their part numbers include the following: ACDelco 48AGM, Delphi BU9048, Optima DH6 and EverStart Platinum AGM H6 (Walmart).

If your Elantra has the Gamma 1.6L turbo I4 engine, you will need a sightly smaller Group Size H5 (also known as "47") battery such as the Delphi BU9047 AGM.

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.

The 12 volt car battery is situated behind the engine air filter housing and to the left of the primary electrical fuse and relay box.


Pull "-" Terminal Off Post
Cover & Tuck Away
Loosen Positive Terminal
I recommend wearing gloves to help prevent accidental electrical contact and electrocution. It would also be a good idea to wear safety glasses.

Avoid touching both the positive and negative terminals or battery posts at the same time!

First, loosen the "-" negative terminal by turning the nut in the counterclockwise direction with the 10mm socket and a 1/4" drive ratchet.

You don't need to remove the terminal nut. Just loosen it a few turns so that the terminal can be pulled off the battery post.

Carefully pull the negative terminal off the "-" battery post.

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

Next, flip open the plastic cover on the positive terminal.

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

Pull Off "+" Terminal
Tuck On Left Side
Remove Heat Shield
Carefully pull the positive terminal off the "+" battery post.

Close the plastic cover and tuck the positive terminal on the left side of the battery to help prevent accidental electrical contact.

Slide the heat shield off the old battery and set it aside for re-installation later on.

12mm & Extension Bars
Hold Down Clamp
Loosen Counterclockwise
Attach the 12mm socket to a long extension bar (or two shorter extension bars) and a 3/8" drive ratchet.

Locate the hold down clamp on the front edge of the battery tray.

Loosen the single bolt on the hold down bar by turning it in the counterclockwise direction with the 12mm socket.

You don't have to fully remove the bolt. I recommend only loosening the bolt a few turns.

Slide the old battery back on the tray towards the rear of the engine bay (closer to the windshield).

If you can't slide the old battery back and out of the hold down clamp, loosen the bolt an extra turn or two.

Lift Out Old Battery
Gently Rest On Ground
OEM Solite 12V Battery
Once the old battery is clear of the hold down clamp, raise the two plastic handles and carefully lift it out of the engine bay.

Gently set the old battery down on the ground.

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

The OEM (original equipment manufacturer) 12V battery in this 2018 Elantra was part number Solite AGM60L-DIN.

Part # AGM60L-DIN
Clean Off Battery Tray
Lower In New Battery
Clean off any dirt or debris on the black plastic battery tray so that the new battery will rest evenly on it.

Since the OEM battery was an AGM (Absorbed Glass Mat) I recommend buying the ACDelco 48AGM battery since it has excellent reviews on Amazon.

AGM batteries tend to have better cold weather performance, are lighter, have a much slower rate of self-discharge and they can withstand being accidentally discharged (deep cycled) unlike traditional flooded lead-acid type car batteries.

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

The "+" positive post should be situated on the left (passenger) side and the "-" negative battery post should be on the right (driver) side of the engine bay.

Slide Into Battery Clamp
Tighten Bolt Clockwise
Lower Heat Shield Box
Slide the front bottom edge of the new battery forward until it is below the hold down clamp.

Then tighten the bolt in the center of the hold down bar in the clockwise direction with the 12mm socket, extension bar and 3/8" drive ratchet until it is snug.

Check to see if the new battery can be moved, rocked or slid around on the tray.

If the new battery can be moved, make sure that the front bottom lip of the new battery is under the hold down clamp and tighten the 12mm bolt an extra turn or two.

Once the new battery is securely installed on the tray, lower the heat shield cover down over it.

If you've been having a problem with corrosion (white or blue powder) building up on the terminals or battery posts, consider installing some felt anti-corrosion washers over the battery posts.

The felt washers are an inexpensive way to prevent from having to replace corroded battery terminals and cables.

Push On Positive Terminal
Tighten Nut Clockwise
Close Plastic Cover
Push the positive terminal over the "+" battery post.

Tighten the nut on the positive terminal by turning it 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 post which could lead to an acid leak.

Flip the black plastic cover over the positive terminal and push on it to secure the retaining clip.

You should feel or hear the retaining clip "click" securely into place.

Push On Negative Terminal
Tighten 10mm Clockwise
12V Battery Replaced
Push the negative terminal over the "-" battery post.

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

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

If you suspect that your alternator is failing or not working properly, test it with a digital multimeter. If the alternator is charging the battery, the voltage with the engine running should be any where from 13V to just over 14V. The battery's voltage with the engine turned off, should read over 12 volts and about 12.6 volts when fully charged.

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

Please remember to adjust the time on the clock and re-program your favorite radio stations before you start driving.

For more, please check out all of my 2017-2020 Hyundai Elantra 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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