Battery Size Group 27

Group Size 27 Battery: Built for Bigger Power Demands in Canada

If your vehicle demands more power—especially in cold weather or for heavier electrical loads—the Group Size 27 battery might be exactly what you need. It’s one of the larger 12V automotive batteries on the market and is known for delivering strong starting performance and deep cycle support for larger vehicles, trucks, and even some RVs and marine applications.

Battery Size, Specs, and Cost in Canada

Group 27 batteries are large and powerful. They typically measure about 12.06 inches long, 6.81 inches wide, and 8.88 inches high. These 12-volt batteries are known for high capacity, usually offering:

Cold Cranking Amps (CCA): 650 to 900
Cranking Amps (CA): 800 to 1000
Amp-Hour (Ah) Rating: 75 to 95Ah

In Canada, a Group 27 battery usually costs between $190 and $280, depending on the brand and whether it's a flooded or AGM type. Most come with a 3-year free replacement warranty, which is ideal for those who rely on their battery in demanding driving conditions.

Vehicles That Use Group Size 27 Batteries

This battery is commonly found in:

Ford F-150 and Expedition
Chevrolet Silverado 1500 and Suburban
Toyota Tundra and Sequoia
Dodge Ram 1500 (older models)
Vans, campers, and marine vessels

It’s a go-to battery for full-size trucks, SUVs, and even trailers with winches or auxiliary power. Not sure what group fits your vehicle? Head over to our Truck Battery Replacement page for help.

Alternative Battery Sizes for Group 27

Can’t find a Group 27 in stock? You may be able to use one of these alternatives—but always confirm fitment and terminal location:

Group 24F – Slightly shorter in length, but some trucks can accommodate it. Dimensions: 10.25" x 6.81" x 8.88"
Group 31 – Longer and heavier; fits larger diesel trucks and RVs. Dimensions: 13.0" x 6.75" x 9.44"
Group 65 – Similar in footprint with reversed terminals; check cable routing. Dimensions: 12.06" x 7.5" x 7.6"

If you’re unsure which to choose, visit How It Works or give our mobile techs a quick call before installing.

How to Know When Your Group 27 Battery Needs Replacing

You don’t need a mechanic to spot battery trouble. Here are a few basic checks:

Listen – Slow engine cranking is a common early sign.
Check the voltage – A fully charged battery should read 12.6 volts or higher.
Run a load test – During engine start, the voltage shouldn’t dip below 9.6 volts.

If you’re not comfortable doing the testing yourself, MobileBattery offers battery testing and replacement on-site—whether you’re parked at home, work, or roadside.

Lifespan of Group 27 Batteries in Canada

Due to harsh winters and hot summers, Group 27 batteries typically last 3 to 5 years in Canada. Larger batteries like this are designed for endurance, but even the best batteries lose power over time—especially with frequent cold starts and high accessory use.

MobileBattery services customers across Canada, including cities like Calgary, Montreal, and Vancouver. To see all our service areas, check out our Where We Service page.