2015 Chevrolet Malibu Battery Size, CCA & Replacement Guide

As an ASE-certified master technician, I’ve replaced countless batteries in the 2013–2015 Chevrolet Malibu generation. The 2015 Malibu, particularly with the 2.5L engine, introduced standard Auto Stop/Start technology, which drastically changed the battery requirements compared to older vehicles. If your Malibu is struggling to start or your auto-stop feature has stopped working, it's time to look at your battery setup.

Here is the complete battery spec guide for your 2015 Chevrolet Malibu.

Quick answer

If you just need the specifications before heading to the parts store, here are the essential details for the 2015 Chevrolet Malibu:

• BCI Group Size: Group H6 (also known as Group 48) is the standard main battery for both the 2.5L and 2.0L Turbo. Note: 2.5L models with Auto Stop/Start also have a secondary auxiliary battery (Group AUX12) located in the trunk.
• Cold Cranking Amps (CCA): 730 to 760 CCA for the main battery.
• Reserve Capacity (RC): 115 to 130 minutes.
• AGM vs Flooded Requirement: AGM (Absorbent Glass Mat) is strictly required for the main battery on models equipped with the Auto Stop/Start system. Standard flooded batteries will fail prematurely.
• Terminal Layout: Top post, Right Positive (Standard).
• Physical Dimensions (H6/48): 10.94" L x 6.89" W x 7.5" H.
• Dual-Battery Setup: Yes, for 2.5L models with Stop/Start. The main H6 battery is under the hood, and a small AUX12 AGM battery is in the trunk (driver's side rear compartment).

Replacement battery options

When replacing the main H6/48 battery in your 2015 Malibu, I recommend sticking to high-quality AGM options. Here are several top-tier replacements:

• ACDelco Gold (OEM Replacement): Part # 48AGM (Excellent reliable choice, factory exact fit).
• DieHard Platinum AGM: Part # 48-AGM (Widely available, excellent warranty and cycling capability).
• Interstate MTX: Part # MTX-48/H6 (A premium AGM battery built for heavy electronics).
• Odyssey Performance Series: Part # 48-720 (Rugged, pure lead plates, exceptional reserve capacity).
• Optima YellowTop: Part # DH6 (Deep cycle and starting power combined, great if you run aftermarket electronics).

If you need to replace the auxiliary battery in the trunk, look for an AUX12 AGM battery (like the ACDelco AUX12).

AGM vs flooded — which does this vehicle need?

If your 2015 Malibu has the 2.5L engine, it is equipped with Chevy's Auto Stop/Start system. This means you absolutely must use an AGM battery.

When the engine shuts off at a stoplight, the battery takes over the entire electrical load of the vehicle (climate control, infotainment, headlights) while simultaneously preparing for an immediate engine restart. Standard flooded lead-acid batteries simply cannot handle this frequent deep-cycling. Installing a flooded battery in a Stop/Start Malibu will result in a deactivated auto-stop system, electrical gremlins, and a dead battery within a matter of months. Even if you have the 2.0L turbo without stop/start, an AGM battery is highly recommended for its durability and longevity.

Post-installation relearn / reset procedure

Unlike some European vehicles, the 2015 Chevy Malibu does not require a complex computerized "battery registration" with a scan tool. However, a post-installation relearn process is still necessary to restore normal vehicle functions:

1. Idle Relearn: After connecting the new battery, start the engine and let it idle in Park for 3-5 minutes. This allows the Engine Control Module (ECM) to relearn its baseline idle strategy.
2. Auto Stop/Start Reset: The stop/start system may not work immediately. The Battery Sensor Module needs to recognize the new battery's state of charge. Simply drive the vehicle normally for a few hours (or let it sit locked for 4–8 hours) so the system can recalibrate.
3. Window Indexing: Roll each power window all the way down and hold the switch for 2 seconds. Then roll it all the way up and hold the switch for 2 seconds to reset the auto-up/down limits.

Signs of a failing battery

Since the 2015 Malibu uses a dual-battery setup on the 2.5L, symptoms can vary depending on which battery is failing:

• Auto Stop/Start disabled: If the dashboard tells you the system is unavailable or the car stops shutting off at red lights, this is often the first sign that either your main or auxiliary battery is degrading.
• Slow engine crank: The starter sounds sluggish, especially on cold mornings.
• Electrical gremlins: Flickering headlights, sluggish power windows, or infotainment system resets.
• Check Engine / Battery Light: A persistent battery warning indicator on the dash.

Common battery issues for this generation

The most frequent issue I see with the 2015 Malibu in the shop is confusion over the dual-battery system. Many owners replace the main H6 battery under the hood but continue to experience electrical issues or a dead car because the trunk-mounted auxiliary battery is dead and pulling the main battery down.

Another common issue is corrosion on the negative battery cable sensor. The 2015 Malibu has a smart charging system with a sensor on the negative cable. If this gets heavily corroded, the alternator won't know how much to charge the battery, leading to undercharging and premature battery failure. Always clean the terminals thoroughly when swapping the battery.

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