🔧 Battery - Replacement

Your Yaris uses a standard 12V battery in the engine bay. Replacing it means disconnecting the old battery, swapping the new one in, and tightening the hold-down and terminals correctly so the car starts reliably.

Difficulty Level: Beginner | Estimated Time: 0.5-1 hour

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⚠️ Safety & Precautions

• Turn the ignition OFF and remove the key before starting.
• Wear safety glasses and gloves. Battery acid can burn skin and eyes.
• Remove the negative cable first, then the positive cable.
• Do not let a wrench touch both battery terminals or metal body parts at the same time.
• Keep sparks, cigarettes, and open flame away from the battery.
• If your radio or clock has memory presets, they may reset when power is disconnected.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 3/8-inch ratchet
• Short extension
• Battery terminal brush
• Flathead screwdriver
• Gloves
• Safety glasses
• Battery carrier strap

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery - Qty: 1

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Turn all lights, fan, and accessories off.
• Open the hood and locate the battery in the engine bay.
• Make sure the replacement battery matches the original size and terminal layout.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the negative cable

• Use the 10mm socket and 3/8-inch ratchet to loosen the negative terminal clamp.
• Lift the cable off the battery post and move it aside so it cannot touch the terminal.
• Negative first prevents accidental shorts.

Step 2: Disconnect the positive cable

• Use the 10mm socket to loosen the positive terminal clamp.
• Remove the cable from the battery and keep it clear of metal parts.

Step 3: Remove the battery hold-down

• Use the 10mm socket, ratchet, and short extension to remove the battery hold-down bracket.
• Set the fasteners aside in a safe place.

Step 4: Lift out the old battery

• Use the battery carrier strap to lift the battery straight up and out.
• The battery is heavy, so keep your back straight and use both hands.

Step 5: Clean the tray and terminals

• Use the battery terminal brush to clean corrosion from the cable ends.
• Wipe the battery tray clean before installing the new battery.

Step 6: Install the new battery

• Set the new battery in the tray with the terminals in the same position as the old one.
• Reinstall the hold-down bracket and tighten the hardware with the 10mm socket.
• Tighten snugly, but do not overtighten.

Step 7: Reconnect the positive cable

• Install the positive cable on the battery post first.
• Use the 10mm socket to tighten the clamp.
• Tighten snugly, but do not overtighten.

Step 8: Reconnect the negative cable

• Install the negative cable last.
• Use the 10mm socket to tighten the clamp.
• Tighten snugly, but do not overtighten.

Step 9: Verify operation

• Start the engine and check that it cranks normally.
• Confirm the dash lights are normal and no warning lights stay on.

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✅ After Repair

• Check that the battery is secure and does not move in the tray.
• Verify the terminal clamps are tight.
• Reset the clock and radio presets if needed.
• If the engine cranks slowly, recheck terminal tightness and battery fitment.

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💰 DIY vs Shop Cost

Shop Cost: $180-$320 (parts + labor)

DIY Cost: $120-$220 (parts only)

You Save: $60-$100 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1 hour.

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🎯 Ready to get started?

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