2015 GMC Sierra 1500 Battery Size & Specs

Quick answer

• BCI Group Size: H6 / Group 48
• Cold Cranking Amps (CCA): 615-730 A
• Reserve Capacity (RC): 120-140 min
• Battery Type: AGM required
• Terminal Layout: Top post, positive right
• Dimensions (L x W x H): 10.9 x 6.9 x 7.5 in

Replacement battery options

• Interstate: MTX-48/H6
• Optima: DH6 YELLOWTOP
• DieHard: Platinum AGM H6
• Odyssey: Performance Series ODP-AGM48 H6 L3
• ACDelco: Gold 48AGM

AGM vs flooded — which does this vehicle need?

The 2015 GMC Sierra 1500 requires an Absorbent Glass Mat (AGM) battery. This is because this generation of Sierra (2014-2018) features a sophisticated electrical system with a feature called Regulated Voltage Control (RVC). This system varies the alternator's output to improve fuel economy, but in doing so, it places a much greater demand on the battery. A conventional flooded lead-acid battery will be quickly damaged by the RVC system. An AGM battery is designed to handle the deeper-cycling and more frequent charging/discharging that the RVC system demands.

Post-installation relearn / reset procedure

After replacing the battery in your 2015 GMC Sierra 1500, a battery relearn procedure is recommended. This allows the Body Control Module (BCM) to recalibrate its state-of-charge parameters for the new battery. While the truck will likely start and run without this procedure, it may not charge the new battery optimally, potentially shortening its lifespan. The relearn procedure typically requires a professional scan tool and is best performed by a qualified technician.

Signs of a failing battery

• Slow engine crank: The engine turns over sluggishly when you try to start it.
• Dimming lights: Headlights and interior lights may dim, especially at idle.
• Warning lights: A battery or charging system warning light may illuminate on the dashboard.
• Electrical issues: You may experience problems with the radio, power windows, or other electrical accessories.
• Swollen or leaking battery case: The battery case appears bloated or is leaking fluid.

Common battery issues for this generation

The most common battery-related issue for the 2014-2018 GMC Sierra 1500 is premature battery failure due to the use of an incorrect (flooded) battery type. As mentioned, the RVC system requires an AGM battery. Another common issue is parasitic draw, where an electrical component continues to draw power after the ignition is off. This can be caused by a faulty module, a stuck relay, or an aftermarket accessory.

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