🔧 Seltos - 12V Battery Replacement

On your Seltos, the 12V battery is under the hood and powers starting and all vehicle electronics. Replacing it is mostly removing the hold-down and swapping the battery, but the connection order matters to prevent electrical damage.

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

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⚠️ Safety & Precautions

• ⚠️ Turn the vehicle OFF, remove the key/fob from the cabin, and wait 3-5 minutes before disconnecting the battery.
• ⚠️ Disconnect the negative (-) cable first and reconnect it last to reduce the chance of a short circuit.
• ⚠️ Do not let a tool touch the battery positive (+) terminal and metal body parts at the same time.
• ⚠️ Batteries are heavy and can leak acid; wear gloves and eye protection.
• ⚠️ If your Seltos has Auto Stop/Start, it may require an AGM/EFB type battery—installing the wrong type can cause early battery failure.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 12mm socket
• 3/8" ratchet
• 3" extension (3/8" drive)
• Torque wrench (3/8" drive)
• Battery terminal puller (specialty)
• Battery carrier strap (specialty)
• Shop rags
• Battery terminal cleaning brush
• Nitrile gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (correct size/spec for your Seltos) - Qty: 1
• Battery terminal anti-corrosion spray - Qty: 1
• Battery terminal felt washers - Qty: 1 set

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Open the hood and keep it securely supported.
• If you want to preserve radio presets/clock, use a memory saver (a small device that keeps power to vehicle memory while the battery is removed).
• Check whether your Seltos has Auto Stop/Start (usually a dash indicator or a button that disables it). If yes, confirm you’re buying the correct AGM/EFB battery type.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm battery type and take a quick photo

• Use your phone to take a clear photo of the battery top label and terminal layout (helps you match the replacement).
• Look for markings like AGM or EFB on the battery label if your Seltos has Auto Stop/Start.

Step 2: Disconnect the negative (-) terminal first

• Use a 10mm socket with a 3/8" ratchet to loosen the nut on the negative (-) terminal clamp.
• Wiggle the clamp up and off the battery post. If it’s stuck, use a battery terminal puller (specialty) (it presses the clamp off without prying).
• Tuck the negative cable to the side so it cannot spring back onto the post.
• Torque to 5.9 Nm (4.3 ft-lbs) when reinstalling.

Step 3: Disconnect the positive (+) terminal

• Use a 10mm socket with a 3/8" ratchet to loosen the nut on the positive (+) terminal clamp.
• Remove the clamp from the post and position the cable safely away.
• Torque to 5.9 Nm (4.3 ft-lbs) when reinstalling.

Step 4: Remove the battery hold-down

• Locate the battery hold-down clamp at the base of the battery.
• Use a 12mm socket, 3/8" ratchet, and 3" extension to remove the hold-down bolt(s).
• Lift out the hold-down bracket and set it aside.
• Torque to 21.6 Nm (15.9 ft-lbs) when reinstalling.

Step 5: Remove the old battery

• Use a battery carrier strap (specialty) to lift the battery straight up and out.
• Lift with legs, not your back.

Step 6: Clean the tray and terminals

• Use shop rags to wipe dirt/corrosion from the battery tray.
• Use a battery terminal cleaning brush to lightly clean the inside of the cable clamps if there is corrosion.

Step 7: Install the new battery

• Lower the new battery into the tray in the same orientation as the old one.
• Reinstall the hold-down bracket and tighten using a 12mm socket and torque wrench.
• Torque to 21.6 Nm (15.9 ft-lbs).

Step 8: Reconnect terminals (positive first, negative last)

• Install the positive (+) clamp first and tighten using a 10mm socket and torque wrench.
• Torque to 5.9 Nm (4.3 ft-lbs).
• Install the negative (-) clamp last and tighten using a 10mm socket and torque wrench.
• Torque to 5.9 Nm (4.3 ft-lbs).
• Install felt washers if you’re using them, then apply anti-corrosion spray to the terminals.

Step 9: Final check

• Gently wiggle each terminal by hand—there should be no movement.
• Make sure no tools are left in the engine bay and the cables are routed like before.

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✅ After Repair

• Start the engine and confirm normal cranking and no warning lights staying on.
• Reset the clock and radio presets if they were lost.
• If the power windows lost auto-up/down: with the engine running, fully raise each window and keep holding the switch up for 2-3 seconds, then fully lower and hold 2-3 seconds.
• Take a short 10-15 minute drive to allow the system to stabilize after power loss.

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💰 DIY vs Shop Cost

Shop Cost: $220-$450 (parts + labor)

DIY Cost: $160-$320 (parts only)

You Save: $60-$130 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.

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Quick question (so you buy the right battery): Does your Seltos have Auto Stop/Start (a dash icon or a button to disable it)? Also, do you want to keep your radio/settings with a memory saver?