🔧 Legacy - Battery Replacement

Your Legacy’s 12V battery powers starting and all electronics. Replacing it is mostly about safe disconnect/reconnect order so you don’t short anything or damage modules.

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

Assumption: Stock battery and factory-style top-post terminals.

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⚠️ Safety & Precautions

• ⚠️ Turn ignition OFF, remove the key, and keep it away from the car.
• ⚠️ Wear eye protection and gloves—battery acid is corrosive.
• ⚠️ Disconnect the negative (-) terminal first and reconnect it last to prevent accidental short circuits.
• ⚠️ Do not allow tools to touch the positive (+) terminal and body metal at the same time.
• ⚠️ If your Legacy has a battery vent tube, reconnect it to the new battery.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 3/8" drive ratchet
• 3" extension for 3/8" ratchet
• 10mm combination wrench
• Battery terminal puller (specialty)
• Battery terminal cleaning brush
• Torque wrench (in-lb or low Nm range)
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V car battery (correct group size for Legacy) - Qty: 1
• Battery terminal anti-corrosion pads - Qty: 2
• Battery terminal protectant spray - Qty: 1

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and locate the battery at the front of the engine bay.
• Expect the clock and radio presets to reset after battery replacement.
• If you have a battery vent tube on the side of the battery, note where it connects.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open access and identify terminals

• Use safety glasses and nitrile gloves.
• Identify the negative (-) terminal (usually black, often marked “-”) and the positive (+) terminal (usually red, marked “+”).

Step 2: Disconnect the negative (-) terminal first

• Use a 10mm socket with a ratchet (or 10mm combination wrench) to loosen the negative terminal clamp nut.
• Wiggle and lift the clamp off the battery post.
• Tuck the cable aside so it can’t spring back.

Step 3: Disconnect the positive (+) terminal

• Use a 10mm socket with a ratchet to loosen the positive terminal clamp nut.
• Remove the clamp from the post. If it’s stuck, use a battery terminal puller (specialty) (a small tool that presses the clamp off without prying).
• Keep the positive cable end from touching metal.

Step 4: Remove the battery hold-down

• Use a 12mm socket, ratchet, and 3" extension to remove the hold-down nuts (usually two).
• Lift off the hold-down bracket and set it aside.

Step 5: Remove the old battery

• Carefully lift the battery straight up and out. Batteries are heavy—lift with your legs, not your back.
• Check the battery tray for corrosion or wetness and wipe it clean.

Step 6: Prepare terminals and install the new battery

• Clean the inside of both cable clamps using a battery terminal cleaning brush.
• Place the new battery in the tray with the terminals oriented the same as the old one.
• If equipped, reconnect the battery vent tube to the vent port on the new battery.
• Install battery terminal anti-corrosion pads on the posts if you’re using them.

Step 7: Reinstall and tighten the hold-down

• Reinstall the hold-down bracket and start the nuts by hand.
• Use a 12mm socket and ratchet to snug evenly.
• Use a torque wrench: Torque to 7.5 Nm (66 in-lbs).

Step 8: Reconnect the positive (+) terminal first

• Install the positive clamp fully down on the post.
• Use a 10mm socket and ratchet to tighten.
• Use a torque wrench: Torque to 5 Nm (44 in-lbs).
• Apply battery terminal protectant spray.

Step 9: Reconnect the negative (-) terminal last

• Install the negative clamp fully down on the post.
• Use a 10mm socket and ratchet to tighten.
• Use a torque wrench: Torque to 5 Nm (44 in-lbs).
• Apply battery terminal protectant spray.

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✅ After Repair

• Start the engine. It should crank strongly and start normally.
• Check that the battery is secure (it should not move by hand).
• Verify no warning lights stay on after a short drive.
• Reset the clock and reprogram radio presets as needed.

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💰 DIY vs Shop Cost

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

DIY Cost: $140-$260 (parts only)

You Save: $80-$160 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.