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What size battery is in the 2018 Silverado?

There isn’t a single fixed battery size for the 2018 Chevrolet Silverado. Most models use a 12-volt starting battery, typically in Group 75 or Group 78 size, with variations for different engines and option packages. To know the exact size for your truck, check the battery label or the owner's manual.

Engine options and how they affect battery needs

The Silverado lineup in 2018 included multiple powertrains, each with different electrical demands. The choice of engine and added features can influence the required battery capacity, cold-cranking amps (CCA), and whether a higher-demand or AGM battery is warranted. Here’s how the main engines typically relate to battery sizing.

Gas-powered options

Gas engines such as the 4.3-liter V6, 5.3-liter V8, and 6.2-liter V8 generally use a similar 12V starting battery, but higher-output engines and optional equipment can push for a battery with higher CCA and reserve capacity.

Duramax diesel option

The 3.0-liter Duramax turbo-diesel adds heavier electrical demands (including glow plugs) and may require a higher-capacity or AGM battery. The exact group size is specified by GM for Duramax-equipped trucks and can differ from gasoline models.

Common battery group sizes you might encounter in the 2018 Silverado

When shopping for a replacement or upgrade, you’ll typically see a few GM-friendly group sizes. This list highlights the sizes most often used by 2018 Silverado models.

Group 75: A common size for many full-size GM trucks; supports typical 730–750 CCA in standard lead-acid configurations.

Group 78: A larger capacity option used on higher-load configurations, typically in the 750–800 CCA range.

AGM options (often labeled as AGM 94R/DLG or similar): Used on some trims or for vehicles with additional electrical demand; provides higher resistance to vibration and better performance in extreme temperatures.

These group sizes cover the majority of 2018 Silverado configurations. Always confirm the exact size on the battery label or in GM’s service data for your specific truck.

How to verify the exact battery size for your 2018 Silverado

To ensure you replace with the correct group size, use these verification steps. They’ll help you match the OEM specification for your exact vehicle.

Check the battery label: Look for markings such as "Group Size" or a group number (e.g., 75, 78, or a model such as 94R).

Consult the owner's manual or service data: The manual lists the recommended battery size and CCA for each engine and trim.

Use your VIN to look up the spec: GM’s service portals, dealer parts catalogs, or aftermarket databases can pull the exact group size for your VIN.

Ask a parts counter or service advisor: Provide your VIN or engine/trimming details, and they’ll confirm the exact group size.

After verifying, you’ll have the precise battery group size to buy, ensuring compatibility and performance. Electrical loads and climate can influence replacement choices, so consider a higher CCA if you regularly drive in cold weather or use many accessories.

Replacing or upgrading your Silverado battery

Replacing a 2018 Silverado battery is straightforward but should be done with safety in mind. If you’re upgrading to a higher-capacity or AGM battery, ensure the alternator and charging system can support the higher load, and check fitment with the battery tray and cables.

Summary

The 2018 Silverado does not have a universal battery size. Most trims use a 12V starting battery in group sizes like 75 or 78, with variations for diesel or high-demand configurations. To be certain, verify the exact group size on the battery label, consult the owner’s manual or GM service data, or use your VIN to pull the specification from official sources. When replacing, match the group size and consider higher CCA if you regularly operate in cold climates or with many accessories.

Where is the battery in a 2018 Chevy Silverado?

The primary starting battery in a 2018 Chevy Silverado is under the hood, located on the passenger side, near the firewall. You will need to open the hood to access it, and it may be partially hidden by a plastic cover and a metal support bar.

This video shows how to access the battery in a 2018 Chevy Silverado: 52sCarParts.comYouTube · Nov 4, 2024

Location: Open the hood and look towards the back of the engine bay on the passenger side, near the firewall.
Access: The battery is likely covered by a plastic component and a metal support bar that needs to be removed first.
Details: A close look at the battery may reveal it is partially obscured by other components, making it appear more difficult to access than expected.

This video shows the battery location in more detail: 51sDairle Auto Classic Restoration RepairYouTube · Apr 3, 2024

What size battery does a Chevy Silverado 1500 take?

A Chevy Silverado 1500 typically uses a Group 48 (H6) or Group 94R (H7) battery, though older models may require a Group 34/78. The exact size needed depends on the specific model year, engine, and required cranking amps, so the best method is to check your owner's manual or the current battery for the correct size information.
Common battery sizes

Group 48 (H6): A compact and reliable option for many standard Silverados.
Group 94R (H7): A good choice for those in colder climates or who use more power-draining accessories, as it offers higher cold-cranking amps (CCA) and a larger reserve capacity.
Group 34/78: May be required for some older Silverado 1500 models.

How to choose the right battery

Check your owner's manual: This is the most reliable way to find the exact specification for your truck.
Inspect your current battery: Look at the label on the battery currently installed in your Silverado for its group size and specifications.
Consider your needs: If you live in a cold climate or regularly use a lot of accessories, a battery with higher CCA and reserve capacity, like a Group 94R, may be a better fit.

What size battery is in the 2018 Silverado 1500?

Most Silverado 1500 trucks use a Group 48 (H6) or Group 94R (H7) battery, both known for strong cold-cranking amps and solid reserve capacity.

Does a 2018 Chevy Silverado have two batteries?

Your vehicle is equipped with 2 types of batteries: Auxiliary (for start/stop and other systems) and Primary (for starting).

Kevin Bennett

Company Owner

Kevin Bennet is the founder and owner of Kevin's Autos, a leading automotive service provider in Australia. With a deep commitment to customer satisfaction and years of industry expertise, Kevin uses his blog to answer the most common questions posed by his customers. From maintenance tips to troubleshooting advice, Kevin's articles are designed to empower drivers with the knowledge they need to keep their vehicles running smoothly and safely.