Battery Size Group 78

Group Size 78 Battery: A Side-Terminal Powerhouse for Trucks and Older GM Vehicles

The Group Size 78 battery is built for drivers who need strong starting power and durability—especially in older GM trucks, SUVs, and sedans that use side-terminal battery setups. It’s a reliable fit for vehicles with higher electrical loads and wider battery trays, making it a solid choice for Canadian winters and daily driving alike.

Specs, Size, and Price in Canada

Group 78 batteries are 12-volt with side-mounted terminals, which is key for certain GM applications. They measure approximately 10.25 inches long, 7.06 inches wide, and 7.88 inches high.

Average performance specs include:

• Cold Cranking Amps (CCA): 700 to 850

• Cranking Amps (CA): 875 to 1000

• Amp-Hour (Ah): 60 to 75Ah

In Canada, a Group 78 battery typically costs between $170 and $250, depending on the brand, chemistry (AGM vs. flooded), and warranty. Most come with a 3-year free replacement warranty, making them a good investment for long-term use.

Vehicles That Use Group 78 Batteries

Group 78 batteries are commonly used in full-size North American vehicles, especially from GM, including:

• Chevrolet Silverado and Suburban (1990s–2000s)

• GMC Sierra and Yukon

• Pontiac Bonneville

• Buick LeSabre and Park Avenue

• Cadillac DeVille and Seville

If you're not sure what your vehicle uses, visit our Car Battery Replacement or Truck Battery Replacement pages for help.

Alternative Battery Sizes for Group 78

If you can’t find a Group 78 in stock, here are some close alternatives:

• Group 75 – Slightly smaller in capacity, also side terminal Dimensions: 9.06" x 7.06" x 7.88"

• Group 34/78 (Dual Terminal) – Offers both top and side posts, versatile fit Dimensions: 10.25" x 6.81" x 7.88"

• Group 34 – Same size, top-post only; may work if cables are long enough Dimensions: 10.25" x 6.81" x 7.88"

Make sure to confirm terminal layout and cable reach before switching. Visit How It Works for more info on battery matching and mobile service.

How to Tell If Your Group 78 Battery Needs Replacement

If your battery is struggling, here are common signs it may be time to replace it:

1. Slow or delayed engine crank

2. Dimming headlights or flickering electronics

3. Corroded or loose side terminals

4. Voltage drops below 12.4V when parked or below 9.6V during startup

Don’t want to guess? MobileBattery offers mobile battery testing and replacements across Canada, including Calgary, Toronto, and Vancouver.

Battery Lifespan in Canada

A Group 78 battery typically lasts 3 to 5 years in Canada. Cold weather, frequent towing, and extended idling can reduce its lifespan. Regular testing is recommended, especially if your battery is older than three years.

To see if we serve your area, visit our Where We Service page.

Need a Group Size 78 Battery Replacement?

Book online now at bookonline.mobilebattery.ca for fast, professional Group 78 battery replacement—right at your home, office, or roadside across Canada.