What type of battery is in a 2004 Chevy Trailblazer?
In most 2004 Chevy Trailblazer models, the vehicle uses a standard 12-volt lead-acid automotive battery (flooded). The exact group size can vary by engine and trim, but Group 75 is the most common replacement size; always verify on the battery label or in the owner’s manual.
Battery type and what that means
The Trailblazer’s electrical system relies on a conventional flooded lead‑acid battery. This is the standard chemistry used in most gasoline-powered GM SUVs of that era. It is not an absorbed glass mat (AGM) or lithium battery in typical configurations, and it serves as the main power source to crank the engine and run accessories when the engine isn’t running.
Common sizes and specifications to know
When shopping for a replacement, you’ll typically see these specs referenced. Use a battery that matches or exceeds the original ratings and fits the vehicle’s battery tray and terminal layout.
- Group size: Group 75 is the most common OEM option for many Trailblazer models; some configurations may use a different group size such as 34/78. Always verify the exact size on your current battery or in the owner’s manual.
- Cold-cranking amps (CCA): Expect roughly 700–800 CCA for engines used in 2004 Trailblazers. Choose a battery with equal or higher CCA than the original spec to ensure reliable starts in cold weather.
- Reserve capacity (RC): Approximately 100–140 minutes; higher RC can help with accessories and long drives with the engine off.
- Terminal layout and polarity: Ensure the replacement has the same terminal arrangement and polarity as the OEM battery to fit the tray and cables.
Concluding that list: A battery with the correct group size, adequate CCA, and compatible terminal layout will keep the Trailblazer starting reliably and running electrical systems smoothly.
How to verify the exact size for your vehicle
Because there were variations by trim and engine, it’s best to confirm the precise specification before purchase. Here are steps to verify the correct battery size and rating for your 2004 Trailblazer:
Practical tips for verification
- Consult the owner's manual or glovebox paperwork for the recommended battery group size and CCA rating.
- Read the label on the current battery; the group size and CCA are printed on the battery top or side.
- Measure the battery tray space (length and width) to ensure the new battery will fit; note the terminal positions for clearance with cables.
- If in doubt, contact an authorized GM parts department or a trusted parts retailer with your VIN to confirm the exact OEM specification.
Final note: For longevity and warranty considerations, use a reputable brand (for example ACDelco, DieHard, Bosch) and ensure it meets or exceeds OEM specifications.
Summary
The 2004 Chevy Trailblazer uses a standard 12‑volt flooded lead‑acid automotive battery. The most common replacement size is Group 75, with typical CCA around 700–800 and RC around 100–140 minutes. Always verify the exact group size and ratings on the current battery label or in the owner's manual, since there were variations by engine and trim. When replacing, match or exceed OEM specifications and ensure fitment in the battery tray and cable layout.
What kind of battery does a 2005 Chevy Trailblazer take?
Optima – Red Battery: 78 Group Size, 800 CCA, 1000 CA, 100 Minute Reserve Capacity, High Power Delivery (Part No. 78)
What size battery is in a 2003 Chevy Trailblazer?
The standard battery size for a 2003 Trailblazer is Group 78. This group size typically features side posts, a height of around 7.257.257.25 inches, a width of about 777 inches, and a length of roughly 10.2510.2510.25 inches. Some models may have different battery requirements, so it is always best to confirm the correct size for your specific vehicle.
- BCI Group Size: 78
- Dimensions (approximate):
- Height: 7.257.257.25 inches ($184$mm)
- Width: 7.067.067.06 inches ($175$mm)
- Length: 10.2510.2510.25 inches ($273$mm)
- Terminal Type: Side post
- Cold Cranking Amps (CCA): Typically between 600600600 and 800800800 CCA, depending on the specific battery.
- Reserve Capacity (RC): Typically between 110110110 and 120120120 minutes.
What battery does a 2004 Trailblazer use?
Optima Red AGM Side Post Battery Group Size 78 800 CCA 100 Minute RC - RED78.
What size battery is in a 2004 Chevy Classic?
Duralast Gold Group Size 75 Battery 75-DLG.
