🔧 Fusion - Battery Replacement

You’ll remove the old 12V battery, install the new one, and reset the battery monitoring system so charging works correctly. A weak or failing battery can cause slow cranking, warning lights, and random electrical issues.

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

Assumption: replacing with the same battery group/size as original.

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⚠️ Safety & Precautions

• ⚠️ Keep keys away from the car; make sure ignition is OFF.
• ⚠️ Wait 5 minutes before disconnecting so modules “go to sleep.”
• ⚠️ Disconnect the negative cable first and reconnect it last.
• ⚠️ Do not pry or pull on the negative cable sensor (battery monitoring sensor); it’s part of the charging system.
• ⚠️ Batteries are heavy and can leak acid—wear gloves and safety glasses.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 8mm socket
• 1/4" ratchet
• 6" socket extension
• Torque wrench (inch-pound or low-range ft-lb)
• Battery terminal puller (specialty)
• Battery post/terminal cleaning brush
• Fender cover

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (match original group size and CCA rating) - Qty: 1
• Battery terminal anti-corrosion pads - Qty: 2
• Battery terminal protector 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 install a fender cover to protect paint.
• If you have one, connect a memory saver (it helps keep radio presets). If not, it’s OK—your car may just need a few resets afterward.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Access the battery

• Open the hood and locate the battery in the engine bay.
• Use a fender cover to prevent scratches while you lean in.

Step 2: Disconnect the negative (–) cable first

• Use an 8mm socket with a 1/4" ratchet to loosen the negative terminal clamp nut.
• Twist the clamp slightly and lift it off the battery post.
• If it’s stuck, use a battery terminal puller (specialty) (this tool gently lifts the clamp without damage).
• Tuck the cable aside so it can’t spring back.

Step 3: Disconnect the positive (+) cable

• Use an 8mm socket with a 1/4" ratchet to loosen the positive terminal clamp nut.
• Remove the clamp from the battery post and set it aside so it can’t touch metal.

Step 4: Remove the battery hold-down

• Locate the hold-down clamp at the base of the battery.
• Use a 10mm socket with a 6" socket extension and 1/4" ratchet to remove the hold-down bolt.
• Lift out the hold-down clamp and set it aside.

Step 5: Remove the old battery

• Lift the battery straight up and out (it’s heavy—use both hands).
• Keep the battery level to avoid any acid spill.

Step 6: Clean and prep the connections

• Use a battery post/terminal cleaning brush to clean the inside of both cable clamps.
• Install battery terminal anti-corrosion pads on the posts (one per post).

Step 7: Install the new battery and secure it

• Set the new battery into the tray in the same orientation as the old one.
• Reinstall the hold-down clamp and bolt using a 10mm socket, 6" socket extension, and 1/4" ratchet.
• Tighten with a torque wrench: Torque to 10 Nm (7 ft-lbs).

Step 8: Reconnect the terminals (positive first)

• Install the positive (+) clamp first. Tighten using an 8mm socket and 1/4" ratchet.
• Tighten with a torque wrench: Torque to 5 Nm (44 in-lbs).
• Install the negative (–) clamp last. Tighten using an 8mm socket and 1/4" ratchet.
• Tighten with a torque wrench: Torque to 5 Nm (44 in-lbs).
• Spray both terminals lightly with battery terminal protector spray.

Step 9: Reset the Battery Monitoring System (BMS)

• Sit in the driver’s seat with all accessories OFF.
• Turn ignition ON (engine OFF).
• Within 10 seconds: flash the high beams 5 times (pull stalk to flash).
• Then press and release the brake pedal 3 times.
• If successful, the battery/charging indicator will flash 3 times (confirmation).

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✅ After Repair

• Start the engine and confirm it cranks strongly.
• Check that no battery warning light stays on.
• Reset the auto-up/down windows if needed: fully lower, hold 2 seconds; fully raise, hold 2 seconds.
• Drive normally for a few trips; the idle may be slightly different while the car relearns.

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💰 DIY vs Shop Cost

Shop Cost: $250-$450 (parts + labor)

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

You Save: $110-$190 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.