🔧 Tucson - 12V Battery Replacement

You’ll remove the old 12V battery under the hood and install a new one with the same size and rating. The key is disconnecting and reconnecting the cables in the correct order to prevent sparks and electrical damage.

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

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⚠️ Safety & Precautions

• ⚠️ Keep keys away from the vehicle while working.
• ⚠️ Wear gloves and safety glasses; batteries can leak acid and produce explosive gas.
• ⚠️ Disconnect the negative (-) terminal first and reconnect it last.
• ⚠️ Do not let your wrench touch metal while on a battery terminal.
• ⚠️ If your battery label says AGM (often on vehicles with Auto Stop/Start), replace with AGM only.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 3/8" ratchet
• 3"-6" socket extension
• 10mm combination wrench
• Battery terminal puller (specialty)
• Battery terminal cleaning brush
• Dielectric grease
• Shop rags
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (match OEM size, CCA, and type shown on battery label) - Qty: 1
• Battery terminal anti-corrosion washers - Qty: 2

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📋 Before You Begin

• Park the Tucson on level ground, shift to Park, and turn the ignition fully OFF.
• Open the hood and locate the battery at the front of the engine bay.
• If you want to keep radio presets, you can use a memory saver (a device that powers the car through the OBD port or 12V outlet while the battery is disconnected).
• Look at the battery label and confirm if it says AGM or not, then buy the same type.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the battery

• If equipped, remove the battery cover using your hands (no tools).
• Use safety glasses and nitrile gloves before touching terminals.

Step 2: Disconnect the negative (-) cable

• Use a 10mm socket with a 3/8" ratchet to loosen the negative terminal clamp nut.
• Twist the clamp gently and lift it off the battery post.
• Tuck the negative cable to the side so it cannot spring back and touch the battery.
• Negative off first prevents accidental shorting.
• Torque to 4-6 Nm (3-4 ft-lbs) during reassembly.

Step 3: Disconnect the positive (+) cable

• Use a 10mm socket with a 3/8" ratchet to loosen the positive terminal clamp nut.
• Lift the clamp off and move it aside carefully (avoid touching nearby metal).
• Torque to 4-6 Nm (3-4 ft-lbs) during reassembly.

Step 4: Remove the battery hold-down

• Locate the battery hold-down bracket at the base of the battery.
• Use a 12mm socket, 3/8" ratchet, and 3"-6" socket extension to remove the hold-down bolt(s).
• Remove the bracket and set it aside.
• Torque to 16-20 Nm (12-15 ft-lbs) during reassembly.

Step 5: Remove the old battery

• Lift the battery straight up using the built-in handle (it’s heavy).
• Set it on the ground upright.
• Wipe the tray area with shop rags.

Step 6: Clean the terminals and prep the new battery

• Use a battery terminal cleaning brush to clean the inside of the cable clamps until shiny.
• If using them, place battery terminal anti-corrosion washers on the new battery posts.
• Apply a thin film of dielectric grease to the battery posts after installation.
• Clean connections prevent no-start issues.

Step 7: Install the new battery

• Place the new battery into the tray in the same orientation as the old one.
• Reinstall the hold-down bracket using the 12mm socket, 3/8" ratchet, and socket extension.
• Torque to 16-20 Nm (12-15 ft-lbs).

Step 8: Reconnect the positive (+) cable first

• Install the positive terminal clamp onto the positive post.
• Use a 10mm socket with a 3/8" ratchet to tighten.
• Torque to 4-6 Nm (3-4 ft-lbs).

Step 9: Reconnect the negative (-) cable last

• Install the negative terminal clamp onto the negative post.
• Use a 10mm socket with a 3/8" ratchet to tighten.
• Torque to 4-6 Nm (3-4 ft-lbs).

Step 10: Reinstall any covers and final check

• Reinstall the battery cover by hand (if equipped).
• Gently try to move the battery—there should be no shifting (hold-down is doing its job).
• If a terminal clamp won’t lift off during removal, use a battery terminal puller (specialty) to press it off safely (it pulls the clamp without hammering).

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✅ After Repair

• Start the Tucson and confirm it cranks normally and the headlights look steady.
• Reset the clock and radio presets if they were lost.
• If the auto-up/down windows don’t work, reinitialize: close the window fully, then keep holding the switch up for 2-3 seconds.
• Check that no battery warning light stays on after the engine is running.

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💰 DIY vs Shop Cost

Shop Cost: $220-$400 (parts + labor)

DIY Cost: $120-$250 (parts only)

You Save: $100-$200 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.