🔧 Renegade - 12V Battery Replacement

You’ll remove the old 12V battery from the engine bay and install a new one with clean, tight connections. A weak battery can cause slow cranking, warning lights, and odd electrical behavior.

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

Assumption: Stock under-hood battery setup; steps include ESS/non-ESS notes.

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⚠️ Safety & Precautions

• ⚠️ Turn ignition OFF, remove key/fob, and keep it 10+ feet away.
• ⚠️ Batteries can vent explosive gas—no sparks, smoking, or open flames.
• ⚠️ Wear eye protection and gloves; battery acid is corrosive.
• ⚠️ Always disconnect the negative (–) cable first and reconnect it last.
• ⚠️ If equipped with ESS (auto start/stop), the system may have an additional battery—disconnect power before touching battery cables.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Nitrile gloves
• 10mm socket
• 13mm socket
• 1/4" drive ratchet
• 3/8" drive ratchet
• 6" extension
• Torque wrench (5-30 Nm range)
• Battery terminal brush
• Trim clip remover
• Memory saver (OBD-II) (specialty)

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Main 12V battery (OEM-equivalent, correct group size and CCA) - Qty: 1
• Auxiliary 12V battery (ESS-equipped only) - Qty: 1
• Battery terminal anti-corrosion pads - Qty: 2
• Battery terminal protectant 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 let the engine bay cool if it’s hot.
• If you have a memory saver (OBD-II), plug it in before disconnecting the battery (it helps preserve radio presets and module memory).
• If your Renegade has ESS (auto start/stop button on the dash), plan on following the ESS notes in the steps below.

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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 compartment.
• Remove any battery cover/insulator using a trim clip remover for clips (if equipped).

Step 2: Disconnect the negative (–) terminal first

• Use a 10mm socket with a 1/4" drive ratchet to loosen the negative terminal clamp nut.
• Lift the negative clamp off the battery post and move it aside so it can’t spring back.
• Tip: Tuck it behind the battery.

Step 3: Disconnect the positive (+) terminal

• Flip open the positive terminal cover (if equipped).
• Use a 10mm socket with a 1/4" drive ratchet to loosen the positive terminal clamp nut.
• Lift the positive clamp off the battery post and position it safely aside.

Step 4: Remove the battery hold-down

• At the base of the battery, remove the hold-down bolt using a 13mm socket, 3/8" drive ratchet, and 6" extension.
• Set the hold-down bracket and bolt aside.

Step 5: Remove the old battery

• Carefully lift the battery straight up and out. Batteries are heavy—lift with your legs, not your back.
• Inspect the tray for corrosion or debris. Clean it as needed.

Step 6: Clean and prep the connections

• Use a battery terminal brush to clean the inside of both cable clamps until they’re shiny.
• Install battery terminal anti-corrosion pads on the battery posts (optional but recommended).

Step 7: Install the new battery

• Set the new battery into the tray in the same orientation as the old one.
• Reinstall the hold-down bracket/bolt using a 13mm socket and 3/8" drive ratchet.
• Torque to 20 Nm (15 ft-lbs) using a torque wrench (5-30 Nm range).

Step 8: Reconnect the positive (+) terminal first

• Install the positive clamp onto the positive post.
• Tighten using a 10mm socket and 1/4" drive ratchet.
• Torque to 5 Nm (44 in-lbs) using a torque wrench (5-30 Nm range).
• Close the positive terminal cover (if equipped).

Step 9: Reconnect the negative (–) terminal last

• Install the negative clamp onto the negative post.
• Tighten using a 10mm socket and 1/4" drive ratchet.
• Torque to 5 Nm (44 in-lbs) using a torque wrench (5-30 Nm range).

Step 10: ESS-equipped note (if your Renegade has auto start/stop)

• If you have an auxiliary battery, replace it as required for proper ESS operation (location varies by equipment; commonly mounted separately from the main battery).
• After reconnection, if ESS stays disabled, the vehicle may require additional drive cycles to re-learn battery state.

Step 11: Reinstall covers and final check

• Reinstall the battery cover/insulator using the trim clip remover if clips were removed.
• Spray terminals lightly with battery terminal protectant spray (avoid soaking).

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✅ After Repair

• Start the engine and confirm normal cranking and no warning lights related to low voltage.
• Check that headlights, wipers, and HVAC blower operate normally.
• If one-touch windows act weird, re-initialize by fully lowering and fully raising each window (hold the switch a couple seconds at each end).
• If you used a memory saver, unplug it after the engine is running normally.

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💰 DIY vs Shop Cost

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

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

You Save: $90-$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.