🔧 Accord - Battery Replacement

Replacing the battery on your Accord is a straightforward job: you’ll remove the hold-down bracket, disconnect the cables, swap the battery, then reconnect everything in the correct order. This restores reliable starting power and prevents low-voltage issues that can cause warning lights or rough idle.

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

---

⚠️ Safety & Precautions

• ⚠️ Work with the engine OFF and key removed; keep metal tools away from both battery posts at once.
• ⚠️ Disconnect negative (-) first and reconnect negative (-) last to reduce short-circuit risk.
• ⚠️ Batteries can vent explosive gas; avoid sparks/flames and wear eye protection.
• ⚠️ If your Accord has memory settings you want to keep, use a memory saver before disconnecting.

---

🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• 1/4" drive ratchet
• 6" extension (1/4" drive)
• 10mm combination wrench
• Torque wrench (in-lb)
• Battery terminal brush (specialty)
• Battery strap handle (specialty)
• Gloves
• Safety glasses

---

🔩 Required Parts

HowToo sells all the parts you need for this repair:

• 12V battery (Group Size 51R) - Qty: 1
• Battery terminal anti-corrosion felt washers - Qty: 2
• Battery terminal protectant spray - Qty: 1

---

📋 Before You Begin

• Park on level ground, shift to neutral, set the parking brake, and open the hood.
• If you’re using a memory saver (a device that keeps vehicle memory powered during battery replacement), connect it now per its instructions.
• Note: After battery disconnect, your Accord may need a quick window “relearn” and idle stabilization (covered below).

---

🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Locate the battery and remove any covers

• Open the hood and locate the battery at the front of the engine bay.
• If there’s a protective cover/insulator, lift it off by hand.

Step 2: Disconnect the negative (-) terminal

• Use a 10mm wrench to loosen the nut on the negative (-) terminal clamp.
• Twist the clamp gently and lift it straight up off the post.
• Push the cable end aside so it cannot spring back onto the battery post.
• Tip: Tuck it behind a safe bracket.
• Torque on install: Torque to 5 Nm (44 in-lbs)

Step 3: Disconnect the positive (+) terminal

• Use a 10mm wrench to loosen the nut on the positive (+) terminal clamp.
• Lift the clamp off the post and move it aside.
• Torque on install: Torque to 5 Nm (44 in-lbs)

Step 4: Remove the battery hold-down bracket

• Use a 10mm socket, ratchet, and extension to remove the hold-down nuts/bolts at the base of the bracket.
• Lift the hold-down bracket off and set it aside.
• Torque on install: Torque to 9 Nm (80 in-lbs)

Step 5: Remove the old battery

• Use a battery strap handle (specialty) to lift the battery straight up and out.
• Keep it upright to avoid spilling any electrolyte (battery acid).

Step 6: Clean the battery terminals and tray

• Use a battery terminal brush (specialty) to clean corrosion from the inside of both cable clamps.
• If the tray area is dirty, wipe it down with a dry rag (do not soak with water).
• Install anti-corrosion felt washers onto the battery posts (one per post).

Step 7: Install the new battery

• Place the new Group 51R battery into the tray in the same orientation as the old one (posts positioned the same).
• Reinstall the hold-down bracket and tighten using a 10mm socket and ratchet.
• Torque: Torque to 9 Nm (80 in-lbs)

Step 8: Reconnect the terminals (positive first)

• Install the positive (+) clamp first. Use a 10mm wrench to tighten.
• Torque: Torque to 5 Nm (44 in-lbs)
• Install the negative (-) clamp last. Use a 10mm wrench to tighten.
• Torque: Torque to 5 Nm (44 in-lbs)
• Spray a light coat of battery terminal protectant on the connections.

Step 9: Final check

• Use a 10mm wrench to confirm both terminal nuts are snug (not over-tight).
• Gently wiggle each terminal by hand—there should be no movement.
• Make sure the battery cannot move in the tray.

---

✅ After Repair

• Start the engine and confirm normal cranking and no flickering dash lights.
• If the idle is a little rough at first, let the engine idle for a few minutes with all accessories OFF (AC, headlights, rear defogger OFF) to stabilize.
• Power window reset (if auto-up/down stops working): with the car ON, fully lower the driver window, then fully raise it and keep holding the switch UP for 2 seconds.
• Reset the clock and radio presets if they were lost.

---

💰 DIY vs Shop Cost

Shop Cost: $220-$380 (parts + labor)

DIY Cost: $150-$260 (parts only)

You Save: $70-$120 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.

Assumption: Your Accord uses the common Group 51R battery configuration.