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Mitsubishi Outlander 12V Automotive Battery Replacement Guide
How to change a weak or dead 12 volt car battery in a 3rd generation 2014 to 2021 Mitsubishi Outlander.

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2020 Outlander 2.4L I4
Right Side - Air Intake
Release Pop Rivet
This automotive maintenance tutorial was specifically written to assist owners of the third generation (2014, 2015, 2016, 2017, 2018, 2019, 2020 & 2021) Mitsubishi Outlander SUV in changing a weak or dead 12V car battery for the MIVEC 4J12 2.4 liter inline four cylinder naturally aspirated engine.  (The procedure should be the same or very similar for models equipped with the 2.0L I4 engine or the 3.0L V6 engine.)

Owners of other Mitsubishi vehicles such as the Outlander Sport, Eclipse Cross, Mirage, Mirage G4, Lancer, ASX, Montero Sport, Pajero, Xpander, Strada and RVR may also find these DIY instructions to be helpful.

The OEM (original equipment manufacturer) "Group Size" is 35 and the part number is Mitsubishi 75D23L.

A few compatible replacement aftermarket Group Size 35 12V batteries with their part numbers include the following: Optima RedTop 8020-164 35, Deka 9A35/85 AGM and Delphi BU9035 AGM.

The tools needed to complete this procedure include a flat head screwdriver, a pop rivet removal tool and a deep well 10mm socket with a 1/4" drive ratchet or a 10mm wrench.

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 under the engine air intake assembly.

Locate the two round black plastic pop rivet fasteners on the front edge of the air intake just behind the radiator cap.

Use the blade of a flat head screwdriver to gently unlock the two pop rivets by prying up the smaller round button head in the center of each fastener.


Pry Out Base of Fastener
Remove Second Fastener
2 Pop Rivets Removed
Then use a pop rivet removal tool or a large flat head screwdriver to pry up the base of each pop rivet.

Set the two pop rivets aside in a safe place.

Lift Air Intake Assembly
Air Intake Removed
Old 12V Battery Exposed
Carefully lift up the front edge of the air intake and pull the rear of it out of the opening in the engine air filter housing.

Set the air intake assembly aside in a safe place.

Once the air intake is out of the way, you'll be able to access the OEM 12V battery.

Do NOT touch both the negative and positive battery posts at the same time to prevent from being electrocuted.

Attention: Please proceed with caution and at your own risk!

Loosen Counterclockwise
Pull Off Negative Terminal
Cover & Tuck Away
First, 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.

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

Wrap the terminal in a small towel and tuck it away below the fuse box to help prevent accidental electrical contact.

Hold Down Clamp
Loosen Two Nuts
Detach Front "J" Hook
Locate the two nuts on the top of the black metal battery hold down clamp.

Loosen the two nuts by turning them in the counterclockwise direction with the deep well 10mm socket and a 1/4" or 3/8" drive ratchet or a 10mm wrench.

You don't need to fully remove the nuts on the two silver bars. Just loosen them enough until the "J" hooks at the bottom of the bars can be released from their mounting slots.

Carefully detach the front and rear "J" hooks from their mounting slots on the battery tray.

Avoid making contacting with the positive and negative battery posts.

Release Rear "J" Hook
Remove Hold Down Bar
Open Red Plastic Cover
Carefully lift the hold down clamp and the two "J" hook bars off the old battery.

Set the hold down clamp and "J" hook bars aside in a safe place.

Flip open the red plastic cover on the top of the "+" positive terminal.

Loosen Counterclockwise
Pull Off Positive Terminal
Move Behind Battery
Loosen the nut on the positive terminal by turning it in the counterclockwise direction.

Pull the positive terminal straight off the "+" terminal.

Tuck the positive terminal back behind the battery by the engine air filter box.

OEM Battery Removed
Clean Off Battery Tray
Lower In New Battery
Please make sure you do NOT make contact with the "+" positive and "-" negative battery posts!

Carefully lift the old 12V battery out of the engine bay.

Rest the battery on the ground and try to avoid dropping or tipping it over to prevent from having battery acid leak out.

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

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

Carefully lower the new battery down into the engine bay.

On this 2020 Outlander SEL, the "+" positive battery post is situated on the left (passenger) side and the "-" negative battery post is located on the right (driver) side of the engine bay.

Push On Positive Terminal
Tighten Nut Clockwise
Close Red Plastic Cover
If you've had a problem with corrosion (white, blue or green powder) building up on the terminals, I recommend installing some felt anti-corrosion washers over the battery posts.

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

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.

Try to avoid over tightening the terminal to prevent from cracking the battery post which could lead to an acid leak.

Flip the red plastic cover over the top of the positive terminal. The cover should "click" securely into place.

Lower Hold Down Clamp
Reinsert Rear "J" Hook
Reattach Front "J" Hook
Lower the hold down clamp and the two "J" hook bars down over the center of the new battery.

Do NOT make contact with the battery terminals or battery posts.

Reattach the front and rear "J" hooks into their slots on the battery tray.

Hold Down Bar In Place
Tighten Both Nuts
Push On "-" Terminal
Tighten the two nuts on the top of the hold down bar by turning them in the clockwise direction with the deep well 10mm socket and a 1/4" or 3/8" drive ratchet until they are snug.

Push the negative terminal over the "-" battery post.

Tighten Negative Terminal
New Battery Installed
Reinstall Air Intake
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.

Check to see if the new 12V battery can be moved, slid or rocked on the tray. If the new battery can be moved, tighten the two nuts on the hold down clamp an extra turn or two.

Reinstall the rear edge of the air intake assembly into the opening in the engine air filter housing.

Line Up Fastener Holes
Replace Two Pop Rivets
Engine Air Intake Secured
Lower the front edge of the air intake assembly over the radiator cover.

Line up the two fastener holes in the air intake with the holes on the radiator cover.

Make sure the buttons or "pins" in the center of each pop rivet fastener is in the up and unlocked position.

Push the two fasteners into the holes in the front lip of the air intake assembly.

Push down the pins to lock the pop rivets into place.

To test the new battery, start the engine.

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

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

Please check out all of the 2014-2021 Mitsubishi Outlander 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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