2019 GMC Sierra 1500 Battery Size & Specifications

Quick Answer: 2019 GMC Sierra 1500 Battery Specifications

If you are replacing the battery in your 2019 GMC Sierra 1500, here are the core specifications you need to know. Note that the exact size depends heavily on your engine configuration (V6, V8, or the 3.0L Duramax diesel) and whether your truck is equipped with the Auto Start/Stop feature.

• BCI Group Size: Group H6 (48) or Group H7 (94R). The H7 is typically used in V8 and diesel models, or those with heavy electrical loads.
• Cold Cranking Amps (CCA): 730 CCA (minimum for H6) up to 850 CCA (typical for H7). Diesel models require higher CCA.
• Reserve Capacity: 115 to 140 minutes, depending on the group size and battery grade.
• AGM vs Flooded Requirement: Absorbed Glass Mat (AGM) is strictly required for all 2019 Sierra 1500s equipped with Auto Start/Stop technology.
• Terminal Layout: Standard top post (Positive on the right).
• Physical Dimensions (H7/94R): 12.4" L x 6.9" W x 7.5" H.
• Physical Dimensions (H6/48): 10.9" L x 6.9" W x 7.5" H.
• Dual-Battery Setup: The 3.0L Duramax diesel may feature a primary and auxiliary battery setup, depending on the accessory package and payload configuration.

Replacement Battery Options

Upgrading to a high-quality battery ensures your truck’s complex electronics and starter are protected. Here are some of the most reliable, ASE-recommended replacements for the 2019 GMC Sierra 1500:

• ACDelco Gold AGM (OEM Replacement): Part # 48AGM (for H6) or 94RAGM (for H7). This is the direct factory-equivalent replacement.
• DieHard Platinum AGM: Available in Group H6 or H7. Excellent warranty and built specifically to handle Auto Start/Stop cycling.
• Interstate MTX Series AGM: Part # MTX-48 H6 or MTX-94R H7. Known for rugged durability in extreme climates.
• Optima YellowTop: Part # DH6 or DH7. A premium deep-cycle and starting battery perfect for trucks running aftermarket winches, lighting, or audio systems.
• Odyssey Performance Series: Part # ODP-AGM48 H6 or ODP-AGM94R H7. Features massive deep-cycling capabilities and high CCA.

AGM vs Flooded — Which Does This Vehicle Need?

For the 2019 GMC Sierra 1500, an AGM (Absorbent Glass Mat) battery is highly recommended and, in most cases, required. This generation of the Sierra utilizes Auto Start/Stop technology to improve fuel economy. Every time the engine shuts off at a red light, the battery is forced to run the infotainment system, climate control fans, headlights, and other modules—and then it must restart the engine a moment later.

A standard flooded lead-acid battery cannot withstand this aggressive cycling and will fail prematurely. AGM batteries recharge faster, handle deep discharges better, and are designed specifically for these high electrical loads. If your truck came with an AGM battery from the factory, you must replace it with an AGM battery.

Post-Installation Relearn / Reset Procedure

Like most modern trucks, the 2019 GMC Sierra 1500 uses a Battery Management System (BMS). The BMS monitors battery age, temperature, and state of charge to optimize alternator output.

When you install a new battery, the BMS must be reset so it doesn't overcharge the new unit (which it does to compensate for an old, degraded battery).

1. Using a Scan Tool: The preferred method is connecting a high-level OBD2 diagnostic scanner to perform a "Battery Monitor System Reset."
2. Without a Scan Tool (Self-Learning): If you don't have a scanner, the truck can often relearn the battery state on its own. After installation, lock the truck and let it sit undisturbed for at least 8 hours (overnight is best) without the key fob nearby. The computer will read the resting voltage and recalibrate the system.

Signs of a Failing Battery

Modern trucks are highly sensitive to voltage drops. Watch out for these symptoms indicating your Sierra's battery is on its way out:

• Auto Start/Stop Disabled: The computer will automatically disable the Start/Stop system if it detects a weak battery.
• Slow Engine Crank: The starter sounds sluggish, especially on cold mornings.
• Random Electrical Gremlins: The infotainment screen flickering, power windows moving slowly, or random warning lights (like StabiliTrak or Trailer Brake warnings) illuminating on the dash.
• Corrosion on Terminals: Excessive blue/white powder on the positive terminal can indicate off-gassing from a failing battery.

Common Battery Issues for This Generation

The 2019 redesign brought a lot of new tech to the Sierra 1500. One of the most common complaints for this generation is premature battery failure—often occurring around the 3-year mark. This is heavily tied to the aggressive demands of the Auto Start/Stop system and the large array of continuous parasitic drains (like the OnStar module and keyless entry sensors). Upgrading to a premium, high-reserve-capacity AGM battery usually mitigates these early failure issues. Additionally, owners living in extremely hot climates (like Texas or Arizona) frequently see even shorter battery lifespans due to heat degradation.

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