🔧 Impreza - Battery Replacement

Your Impreza’s 12V battery lives in the engine bay and can be swapped with basic hand tools. The key is removing and installing the cables in the correct order to avoid sparks and electrical damage.

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

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⚠️ Safety & Precautions

• ⚠️ Turn the ignition OFF, remove the key, and keep it out of the car.
• ⚠️ Wear eye protection and gloves; batteries can vent acid and explosive gas.
• ⚠️ Always disconnect the negative (-) cable first and reconnect it last.
• ⚠️ Do not let a tool touch the battery positive and any metal body part at the same time.
• ⚠️ If your battery is leaking or swollen, handle carefully and replace immediately.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 3" extension (1/4" drive)
• 10mm combination wrench
• Torque wrench (inch-pound or low-range) (specialty)
• Battery terminal puller (specialty)
• Battery post/terminal cleaning brush
• Small wire brush
• Shop rags
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V car battery (Group 35, top-post) - Qty: 1
• Battery terminal anti-corrosion spray - Qty: 1
• Dielectric grease - Qty: 1
• Battery terminal felt washers - Qty: 1 set

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📋 Before You Begin

• Park on level ground, transmission in neutral, and set the parking brake.
• Open the hood and let the engine bay cool if it’s hot.
• If you want to preserve radio presets, use a memory saver. A memory saver is a device that keeps power during battery swap.
• No infotainment service mode is required for this battery replacement.

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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 at the front of the engine bay.
• Use shop rags to wipe off dirt so you can see the terminals clearly.

Step 2: Disconnect the negative (-) cable first

• Use a 10mm wrench 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). It pulls the clamp off safely.

Step 3: Disconnect the positive (+) cable

• Flip open the red protective cover (if equipped).
• Use a 10mm wrench to loosen the positive terminal clamp nut and remove the clamp.
• Tuck the positive cable aside so it cannot spring back onto the post.

Step 4: Remove the battery hold-down bracket

• Use a 10mm socket, ratchet, and 3" extension to remove the two hold-down nuts.
• Lift off the hold-down bracket and J-hooks.
• Set the hardware aside where it won’t fall into the engine bay.

Step 5: Remove the old battery

• Wear nitrile gloves and safety glasses.
• Lift the battery straight up and out (it’s heavy—use your legs, not your back).
• Check the battery tray for corrosion or wet acid residue; wipe with shop rags.

Step 6: Clean the terminals and posts

• Use a battery post/terminal cleaning brush to clean the inside of each cable clamp.
• Use a small wire brush to clean the hold-down hardware if it’s rusty.
• Install battery terminal felt washers on the new battery posts (if using).

Step 7: Install the new battery

• Place the new battery onto the tray in the same orientation as the old one (posts in the same positions).
• Reinstall the hold-down bracket and J-hooks.
• Use a 10mm socket and ratchet to snug the hold-down nuts evenly.
• Torque to 7.5 N·m (66 in-lbs) using a torque wrench (specialty). A torque wrench tightens to an exact setting.

Step 8: Reconnect the positive (+) cable first

• Install the positive clamp onto the positive post.
• Use a 10mm wrench to tighten the clamp nut.
• Torque to 4.4 N·m (39 in-lbs) using a torque wrench (specialty).
• Apply a light coat of dielectric grease to the outside of the connection, then use battery terminal anti-corrosion spray.

Step 9: Reconnect the negative (-) cable last

• Install the negative clamp onto the negative post.
• Use a 10mm wrench to tighten the clamp nut.
• Torque to 4.4 N·m (39 in-lbs) using a torque wrench (specialty).
• Spray with battery terminal anti-corrosion spray.

Step 10: Final check

• Grab each clamp by hand and verify it does not rotate on the post.
• Make sure the battery cannot move (hold-down is secure).
• Remove tools from the engine bay and close the hood.

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✅ After Repair

• Start the engine and confirm it cranks strongly.
• Check that no warning lights stay on after a short drive.
• Reset the clock and any radio presets if they were lost.
• If idle is a little rough at first, let it idle for a few minutes; it usually stabilizes on its own.

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💰 DIY vs Shop Cost

Shop Cost: ₹6,000-₹12,000 (parts + labor)

DIY Cost: ₹4,500-₹10,500 (parts only)

You Save: ₹1,500-₹3,500 by doing it yourself!

Shop labor rates vary but typically run ₹800-₹1,500/hour. This repair takes a shop approximately 0.5-1.0 hours.

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🎯 Ready to get started?

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