🔧 Highlander - 12V Battery Replacement

You’ll be removing the old 12V battery under the hood and installing a new one, then restoring power settings. A weak battery can cause slow cranking, warning lights, and random electrical glitches.

Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours

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⚠️ Safety & Precautions

• ⚠️ Wear eye protection and gloves—battery acid is corrosive.
• ⚠️ Keep sparks/flames away; batteries can produce explosive gas.
• ⚠️ Always remove the negative (-) cable first and install it last to prevent accidental short circuits.
• ⚠️ Do not let a tool touch the battery positive (+) and any metal body part at the same time.
• ⚠️ Battery disconnect is not strictly required, but you will be disconnecting power during this job.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 10mm wrench
• 12mm socket
• Ratchet
• 3-inch extension
• Torque wrench (inch-pound or small Nm range)
• Battery terminal puller (specialty)
• Wire brush
• Battery post/terminal cleaning brush
• Shop rags
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (Group Size 24F) - Qty: 1
• Battery terminal anti-corrosion pads - Qty: 2
• Battery terminal protectant spray - Qty: 1

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📋 Before You Begin

• Park your Highlander on level ground, shift to P, and turn the ignition fully OFF.
• Open the hood and locate the battery on the driver-side front area of the engine bay.
• If you want to keep radio presets, you can use a memory saver. If you don’t have one, it’s okay—you’ll just reset a few settings afterward.
• Take a quick photo of cable routing first.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the negative (-) battery cable

• Use a 10mm wrench to loosen the nut on the negative terminal clamp (marked “-” or black cable).
• Wiggle the clamp and lift it straight up off the battery post.
• If it’s stuck, use a battery terminal puller (specialty). A terminal puller is a small tool that lifts the clamp off without prying and breaking it.
• Move the negative cable aside so it cannot spring back and touch the battery.

Step 2: Remove the positive (+) battery cable

• Flip open the red protective cover (if equipped).
• Use a 10mm wrench to loosen the positive terminal clamp nut.
• Lift the clamp off and move it aside so it can’t touch metal.

Step 3: Remove the battery hold-down bracket

• Use a 12mm socket, ratchet, and 3-inch extension to remove the hold-down bolts/nuts.
• Lift off the hold-down bracket and set it aside.

Step 4: Remove the old battery

• Carefully lift the battery straight up and out. It’s heavy—keep your back straight and lift with your legs.
• Set it on the ground upright (do not tip it).

Step 5: Clean the tray and terminals

• Use shop rags to wipe the battery tray clean.
• Use a battery post/terminal cleaning brush (or wire brush) to clean inside the cable clamps until shiny.
• Install battery terminal anti-corrosion pads onto the battery posts (or onto the clamps, depending on pad style).

Step 6: Install the new battery

• Place the new Group Size 24F battery into the tray in the same orientation as the old one (posts in the same locations).
• Reinstall the hold-down bracket and start the fasteners by hand first.
• Use a 12mm socket and torque wrench to tighten the hold-down fasteners: Torque to 20 Nm (15 ft-lbs).

Step 7: Reconnect the positive (+) cable first

• Slide the positive clamp fully down onto the positive post.
• Use a 10mm socket and torque wrench to tighten the terminal clamp nut: Torque to 5 Nm (44 in-lbs).
• Close the red protective cover (if equipped).

Step 8: Reconnect the negative (-) cable last

• Slide the negative clamp fully down onto the negative post.
• Use a 10mm socket and torque wrench to tighten the terminal clamp nut: Torque to 5 Nm (44 in-lbs).
• Spray a light coat of battery terminal protectant spray on the terminals (optional but helpful).

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✅ After Repair

• Start your Highlander and confirm it cranks normally and idles smoothly.
• Check that no battery cables can move by hand; they should be snug and fully seated.
• Reset clock and radio presets if they were lost.
• If the driver window auto-up/down stops working: raise the window fully, then keep holding the switch up for 2-3 seconds to relearn.
• Dispose of the old battery properly—parts stores usually take it for recycling.

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💰 DIY vs Shop Cost

Shop Cost: $220-$420 (parts + labor)

DIY Cost: $160-$300 (parts only)

You Save: $60-$180 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.