🔧 Altima - 12V Battery Replacement

You’ll remove the old 12V battery, transfer any insulators/vent parts if equipped, and install the new one with clean, tight connections. Doing it correctly prevents no-start issues and protects the Altima’s electrical system (especially the sensor on the negative cable).

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

---

⚠️ Safety & Precautions

• ⚠️ Turn the car OFF, remove the key, and keep it away from the car while working.
• ⚠️ Wear eye protection; battery acid corrosion can irritate skin/eyes.
• ⚠️ Always disconnect the negative (-) terminal first, reconnect it last.
• ⚠️ Do not pry on or strike the battery current sensor (the plastic sensor ring/module on the negative cable). It measures battery current for charging control.
• ⚠️ No battery disconnect “coding” is typically required on your Altima, but you may lose radio presets/clock.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" extension for 1/4" drive
• Torque wrench (inch-pound) 20-200 in-lb
• Battery terminal brush
• Nitrile gloves
• Safety glasses
• Fender cover

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (match your current group size and CCA) - Qty: 1
• Battery terminal anti-corrosion pads - Qty: 2
• Battery terminal protectant spray - Qty: 1

---

📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and let the engine bay cool if it’s hot.
• If you want to keep settings, use a memory saver (a small backup power device) only if you’re familiar with it; otherwise skip it for safety.

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the battery and identify terminals

• Remove any battery cover/insulator (if equipped) by hand.
• Identify the negative (-) terminal (usually black/marked “-”) and positive (+) terminal (usually under a red cover).

Step 2: Disconnect the negative (-) terminal first

• Use a 10mm socket with a 1/4" ratchet to loosen the negative terminal clamp nut.
• Wiggle the clamp upward to remove it from the post; do not pull on wires.
• Move the cable aside so it cannot spring back onto the battery post.

Step 3: Disconnect the positive (+) terminal

• Flip open/remove the red cover (if equipped).
• Use a 10mm socket to loosen the positive terminal clamp nut.
• Remove the clamp from the post and position it aside so it cannot touch metal.

Step 4: Remove the battery hold-down

• Use a 10mm socket with an extension to remove the hold-down nuts on the J-bolts (the long threaded rods).
• Lift off the hold-down bracket and set it aside.

Step 5: Remove the old battery

• With nitrile gloves on, lift the battery straight up and out. Batteries are heavy; keep your back straight.
• Inspect the tray area for corrosion or dampness.

Step 6: Clean the terminals and tray

• Use a battery terminal brush to clean the inside of both cable clamps until shiny metal shows.
• If corrosion is heavy, clean and dry the area before installing the new battery.
• Install battery terminal anti-corrosion pads on the posts (one per post).

Step 7: Install the new battery and secure it

• Place the new battery into the tray in the same orientation as the old one.
• Reinstall the hold-down bracket and start the nuts by hand to avoid cross-threading.
• Use a 10mm socket to snug the hold-down nuts evenly.
• Use an inch-pound torque wrench: Torque the battery hold-down nuts to 48 in-lb (5.4 N·m).

Step 8: Reconnect the positive (+) terminal first

• Install the positive clamp onto the positive post.
• Use a 10mm socket to tighten the clamp.
• Use an inch-pound torque wrench: Torque the terminal clamp nut to 48 in-lb (5.4 N·m).
• Close the red terminal cover (if equipped).

Step 9: Reconnect the negative (-) terminal last

• Install the negative clamp onto the negative post carefully, keeping the battery current sensor aligned and not stressed.
• Use a 10mm socket to tighten the clamp.
• Use an inch-pound torque wrench: Torque the terminal clamp nut to 48 in-lb (5.4 N·m).
• Spray a light coat of battery terminal protectant spray on both terminals.

Step 10: Reinstall any battery cover/insulator

• Reinstall the cover/insulator by hand so it sits fully and doesn’t pinch cables.

---

✅ After Repair

• Start the Altima and verify it cranks strongly and the charging light is off.
• Set the clock and re-save radio presets if needed.
• If your power windows lost “auto” function: with the engine running, fully raise the window and hold the switch in the UP position for a few seconds, then test auto-up/auto-down.
• Check that the battery is secure (no movement) and cables are tight (no rotation on posts).

---

💰 DIY vs Shop Cost

Shop Cost: $180-$350 (parts + labor)

DIY Cost: $120-$260 (parts only)

You Save: $60-$150 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.

---

🎯 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.