🔧 Tucson - Battery Replacement

This repair replaces the 12-volt starting battery in your Tucson. A weak battery can cause slow cranking, warning lights, no-start issues, and electrical glitches.

Difficulty Level: Beginner | Estimated Time: 20-40 minutes

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⚠️ Safety & Precautions

• ⚠️ Always remove the negative battery cable first to reduce the chance of sparks.
• ⚠️ Battery acid can burn skin and eyes. Wear safety glasses and gloves.
• ⚠️ Do not touch a wrench between the positive terminal and any metal body part.
• ⚠️ Keep flames, cigarettes, and sparks away from the battery.
• ⚠️ Battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 3/8-inch ratchet
• 3/8-inch extension 6-inch
• Battery terminal cleaner brush
• Torque wrench inch-pound
• Memory saver 12V OBD-II (specialty)
• Safety glasses
• Nitrile gloves

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V automotive battery Group 124R/H6 AGM or equivalent flooded lead-acid - Qty: 1
• Battery terminal protectant spray - Qty: 1
• Battery terminal anti-corrosion washers - Qty: 2

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📋 Before You Begin

• Park your Tucson on level ground and shift to Park.
• Set the parking brake and turn the ignition fully OFF.
• Remove the key from the vehicle and keep it away from the ignition area.
• If using a memory saver, plug it into the OBD-II port before disconnecting the battery. A memory saver is a small backup power tool that helps preserve radio presets and learned settings.
• If you do not use a memory saver, the clock, radio presets, and some automatic window behavior may need to be reset afterward.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Open the Hood

• Pull the hood release inside the cabin.
• Open the hood and secure it with the hood prop rod.
• Put on safety glasses and nitrile gloves.
• The battery is in the engine bay on the driver-side/front area.

Step 2: Connect the Memory Saver

• Use the memory saver 12V OBD-II if you have one.
• Plug it into the OBD-II diagnostic port under the driver-side lower dash.
• Skip this if unavailable.

Step 3: Remove the Negative Battery Cable

• Find the negative terminal marked with a minus sign (-).
• Use a 10mm socket and 3/8-inch ratchet to loosen the negative terminal clamp nut.
• Twist the cable end gently and lift it off the battery post.
• Move the cable aside so it cannot spring back and touch the battery.
• Negative cable always comes off first.

Step 4: Remove the Positive Battery Cable

• Open the red positive terminal cover by hand.
• Find the positive terminal marked with a plus sign (+).
• Use a 10mm socket and 3/8-inch ratchet to loosen the positive terminal clamp nut.
• Lift the positive cable off the battery post and move it aside.
• Do not let your tool touch the positive terminal and metal body at the same time.

Step 5: Remove the Battery Hold-Down Bracket

• The hold-down bracket is the metal clamp that keeps the battery from moving.
• Use a 12mm socket, 3/8-inch extension 6-inch, and 3/8-inch ratchet to remove the battery hold-down bolt.
• Lift out the hold-down bracket and set it aside.

Step 6: Remove the Old Battery

• Grip the battery firmly with both hands.
• Lift it straight up and out of the tray.
• Batteries are heavy, so keep your back straight and lift with your legs.
• Set the old battery upright on the ground.

Step 7: Clean the Battery Terminals and Tray

• Use a battery terminal cleaner brush to clean the inside of both cable clamps.
• Use the same battery terminal cleaner brush to clean any corrosion from the battery tray area.
• If there is white or green powder, avoid touching it with bare hands.
• Clean metal makes better electrical contact.

Step 8: Install the New Battery

• Place the new 12V automotive battery Group 124R/H6 AGM or equivalent flooded lead-acid into the tray.
• Make sure the positive post is on the same side as the positive cable.
• The battery must sit flat in the tray.

Step 9: Reinstall the Hold-Down Bracket

• Install the battery hold-down bracket by hand first.
• Use a 12mm socket, 3/8-inch extension 6-inch, and torque wrench inch-pound to tighten the hold-down bolt.
• Torque to 8-10 Nm (71-89 in-lbs).
• Do not overtighten. The battery case can crack.

Step 10: Install Anti-Corrosion Washers

• Place one battery terminal anti-corrosion washer over the positive battery post.
• Place one battery terminal anti-corrosion washer over the negative battery post.
• These washers help slow corrosion around the terminals.

Step 11: Reconnect the Positive Battery Cable

• Push the positive cable clamp fully down onto the positive post marked (+).
• Use a 10mm socket and torque wrench inch-pound to tighten the clamp nut.
• Torque to 4-6 Nm (35-53 in-lbs).
• Close the red positive terminal cover by hand.
• Positive cable goes on first.

Step 12: Reconnect the Negative Battery Cable

• Push the negative cable clamp fully down onto the negative post marked (-).
• Use a 10mm socket and torque wrench inch-pound to tighten the clamp nut.
• Torque to 4-6 Nm (35-53 in-lbs).
• Remove the memory saver 12V OBD-II if one was used.

Step 13: Apply Terminal Protectant

• Use battery terminal protectant spray on the connected battery terminals.
• Spray a light coat over the metal clamps and posts.
• Do not soak nearby wiring or plastic covers.

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✅ After Repair

• Start your Tucson and make sure it cranks normally.
• Check that the battery warning light turns off after the engine starts.
• Reset the clock and radio presets if needed.
• If the auto-up window feature does not work, hold the window switch up for 3-5 seconds after the window fully closes.
• Drive normally for 10-15 minutes so the idle and transmission adaptive settings can relearn.
• Recycle the old battery at a parts store, repair shop, or battery recycler.

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💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

DIY Cost: $150-$260 (parts only)

You Save: $70-$120 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.3-0.6 hours.

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🎯 Ready to get started?

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