2014–2021 Mitsubishi Outlander

2014-2021 Mitsubishi Outlander - Battery Replacement

By Tom Becker ✓ Certified Mechanic · Published Sep 21, 2026 · Updated Oct 22, 2026

🔧 Easy 20–30 minutes $140 DIY

Save $140 by doing it yourself! Shop cost: $280

Quick answer: Battery Replacement on a 2014–2021 Mitsubishi Outlander is rated Easy and takes about 20–30 minutes. You'll need 4 tools for this job, and parts cost about $140. This guide walks you through the full job step by step, including the mistakes to avoid.

Quick Video Tutorial

Parts You Need

Total Cost

$140.00

Part Name	Part Number	Price	Buy
Correct group-size battery	—	$140.00	Amazon
Terminal cleaner Optional	—	$8.00	Amazon
Terminal protectant Optional	—	$7.00	Amazon

About prices: shown prices are typical retail averages and change frequently; cheaper alternatives may be available. Confirm the current price before buying.

💡 Pro tip: Order all parts at once to save on shipping

Step-by-Step Instructions

Follow these steps carefully

Confirm your Outlander’s battery spot

Park on level ground, set the parking brake, and switch everything off. Pop the hood and find the 12-volt battery in the engine bay. Gather a 10mm wrench or socket, a ratchet, and a terminal brush.

Disconnect the negative terminal first

Loosen the terminal clamp nut, twist and pull the clamp off the negative post, and tuck the cable back where it cannot touch the post again. This breaks the ground circuit so the rest of the job is safe to do with metal tools.

Open the red cover and disconnect the positive

Loosen the positive clamp nut and lift the cable off the post, then flip the cover closed again over the loose terminal area to keep things tidy.

🔧 Mechanic's note — Ray Delgado

I learned this the hard way: Flip the red plastic cover open over the positive (+) terminal — it is there to stop accidental contact, so do not force the cable off with it closed.

Unbolt the J-hook hold-down

Loosen the nuts on the J-hook hold-down rods and lift the hold-down bar or bracket off the battery. Slide the J-hooks out of their tray holes and set the whole hold-down assembly aside.

Lift out the old battery and clean the tray

While the tray is empty, brush out any debris and neutralize white or green crust with a baking-soda-and-water mix, then check the drain holes are clear and any rubber pads are intact.

🔧 Mechanic's note — Ray Delgado

Lift the old battery straight up and out of the engine bay — avoid tipping it or dropping it on painted panels. I don't skip this anymore.

Install the new battery and secure it

Set the hold-down bar back across it, thread the J-hooks through the tray holes, and tighten the nuts until the battery is snug and cannot rock — firm, not crushing.

Reconnect, close the cover, and test

Reconnect in reverse order: positive cable first with its red cover flipped open, tighten the clamp, then the negative cable last — snug both. Flip the red cover closed, start the car, and confirm it cranks strongly.

All Done!

Test your repair before closing everything up. If something doesn't work right, double-check your steps.

⚠️ Common Mistakes to Avoid

• Flipping the red positive cover closed and then trying to remove the cable underneath it
• Overtightening the J-hook nuts and distorting the new battery’s case
• Forgetting to move the battery insulator or any foam pads from the old battery to the new one
• Applying this guide to an Outlander PHEV — its 12-volt battery is mounted at the rear, not under the hood

Tools You'll Need

10mm wrench or socket with ratchet Battery terminal brush Baking soda and water mix for tray cleaning Nitrile gloves Safety glasses Memory saver (optional)

Related Trouble Codes

P0562 System Voltage Low

Torque Specifications

Critical specs — don't skip these!

Bolt	Nm	ft-lbs
Battery hold-down	11	8

Important: Use a calibrated torque wrench. Over-tightening can strip threads. Under-tightening can loosen parts.

⚠️ Safety First!

• Wear safety glasses — baking-soda dust and old acid residue get airborne when you brush the tray
• Never let a tool rest across the battery where it could touch both posts at once
• Lift from the base with two hands and keep the battery level to avoid spilling acid