🔋 Altima - Battery Replacement

Replacing the 12-volt battery on your Altima is a beginner-friendly job. The battery supplies power for starting the engine and running electronics, and a weak battery can cause slow cranking, warning lights, or no-start issues.

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.
• ⚠️ Do not let metal tools touch both battery terminals at the same time.
• ⚠️ Battery acid can burn skin and eyes, so wear gloves and safety glasses.
• ⚠️ Keep open flames and cigarettes away from the battery area.
• ⚠️ Battery disconnect is required for this repair.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm wrench
• 10mm socket
• 3/8-inch ratchet
• 6-inch extension
• Battery terminal cleaner brush
• Battery carrying strap
• Memory saver 12V OBD-II tool
• Digital multimeter
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V automotive battery - Qty: 1
• Battery terminal protectant - Qty: 1
• Battery corrosion cleaner - Qty: 1

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📋 Before You Begin

• Park your Altima on level ground, shift to Park, and set the parking brake.
• Turn off the ignition, headlights, climate control, radio, and all accessories.
• Open the hood and make sure it is securely supported.
• A memory saver is a small device that keeps radio presets and learned settings powered while the battery is disconnected. Use it if available.
• If using a memory saver, plug the memory saver 12V OBD-II tool into the OBD-II port under the driver side dash before disconnecting the battery.
• Do not close the hood completely while the battery is removed.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the Battery

• Open the hood and locate the battery in the engine compartment.
• Use safety glasses and nitrile gloves before touching the battery.
• Identify the negative terminal marked with a minus sign and the positive terminal marked with a plus sign.
• Take a photo first.

Step 2: Disconnect the Negative Cable

• Use a 10mm wrench to loosen the nut on the negative battery terminal clamp.
• Twist the clamp gently and lift it off the battery post.
• Move the cable away from the battery so it cannot spring back and touch the terminal.
• Do not remove the positive cable first.

Step 3: Disconnect the Positive Cable

• Lift the red protective cover from the positive battery terminal.
• Use a 10mm wrench to loosen the positive terminal clamp nut.
• Remove the positive cable from the battery post and move it aside.
• Keep your wrench away from body metal while working on the positive terminal.

Step 4: Remove the Battery Hold-Down Bracket

• The hold-down bracket is the metal clamp that keeps the battery from moving while driving.
• Use a 10mm socket, 3/8-inch ratchet, and 6-inch extension to loosen and remove the hold-down fasteners.
• Lift the hold-down bracket away and set it aside in the same orientation.
• Do not drop the J-hooks.

Step 5: Remove the Old Battery

• Use a battery carrying strap to lift the battery straight up and out of the tray.
• Keep the battery upright at all times.
• Set it on the ground carefully. Batteries are heavy, so use both hands.

Step 6: Clean the Battery Tray and Cable Ends

• Use a battery terminal cleaner brush to clean the inside of both cable clamps.
• If you see white or green crusty buildup, use battery corrosion cleaner according to the product directions.
• Wipe the battery tray area dry before installing the new battery.
• Clean terminals help strong starts.

Step 7: Install the New Battery

• Use a battery carrying strap to lower the new battery into the tray.
• Make sure the positive and negative posts are in the same positions as the old battery.
• Confirm the battery sits flat in the tray and does not rock.

Step 8: Reinstall the Battery Hold-Down Bracket

• Install the hold-down bracket over the battery.
• Use a 10mm socket, 3/8-inch ratchet, and 6-inch extension to tighten the hold-down fasteners evenly.
• Torque to 5 Nm (44 in-lbs).
• Do not overtighten. The battery case can crack.

Step 9: Connect the Positive Cable First

• Place the positive cable clamp fully down onto the positive battery post.
• Use a 10mm wrench to tighten the clamp nut.
• Torque to 5 Nm (44 in-lbs).
• Close the red protective cover over the positive terminal.

Step 10: Connect the Negative Cable Last

• Place the negative cable clamp fully down onto the negative battery post.
• Use a 10mm wrench to tighten the clamp nut.
• Torque to 5 Nm (44 in-lbs).
• A small spark can happen when reconnecting. That is usually normal.

Step 11: Protect the Terminals

• Use battery terminal protectant on the installed battery terminals.
• Do not spray protectant before the clamps are tightened.
• Make sure both cable clamps are tight and cannot twist by hand.

Step 12: Check Battery Voltage

• Set the digital multimeter to DC volts.
• Touch the red meter lead to the positive terminal and the black lead to the negative terminal.
• A fully charged new battery should read about 12.6 volts with the engine off.
• Start the engine and check again. Charging voltage should typically be about 13.5-14.8 volts.

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✅ After Repair

• Start your Altima and make sure it cranks normally.
• Confirm the battery warning light turns off after the engine starts.
• Reset the clock and radio presets if a memory saver was not used.
• Drive normally for 10-15 minutes so the idle and transmission systems can relearn after battery disconnect.
• If the power window auto-up feature does not work, fully lower the window, then fully raise it and hold the switch up for 3-5 seconds.
• Recycle the old battery at a parts store or battery recycler. Do not throw it in household trash.

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💰 DIY vs Shop Cost

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

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

You Save: $80-$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?

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.