Battery Size Group 51

Group Size 51 Battery: A Compact and Efficient Option for Canadian Vehicles

The Group Size 51 battery is a popular choice for small to mid-size vehicles that need a compact but capable power source. Commonly found in Japanese and Korean imports, this battery delivers dependable performance, even in cold Canadian winters. If you're driving a car with limited engine bay space or moderate electrical needs, the 51 is a reliable, budget-friendly option.

Size, Specs, and Price in Canada

Group 51 batteries are 12-volt and measure approximately 9.38 inches long, 5.06 inches wide, and 8.75 inches high. These batteries are designed to be compact without sacrificing cold-start reliability.

Typical specifications include:

Cold Cranking Amps (CCA): 410 to 500
Cranking Amps (CA): 500 to 625
Amp-Hour (Ah): 35 to 45Ah

In Canada, you can expect to pay between $140 and $200 for a Group 51 battery, depending on brand and battery type (flooded or AGM). Most options come with a 2- to 3-year free replacement warranty, giving drivers added peace of mind.

Vehicles That Use Group 51 Batteries

Group 51 batteries are commonly found in:

Honda Fit and Civic (older and hybrid models)
Toyota Prius and Yaris
Mazda 2 and 3 (select trims)
Nissan Versa, Micra, and Cube
Hyundai Accent and Kia Rio

These batteries are ideal for vehicles with tighter engine bays and lower overall power demands. Not sure what size fits your car? Visit our Car Battery Replacement page for guidance.

Alternative Battery Sizes for Group 51

If a Group 51 battery isn’t in stock, there are a few close alternatives. However, always double-check tray dimensions and terminal layout:

Group 51R – Same size with reversed terminals Dimensions: 9.38" x 5.06" x 8.75"
Group 151R – Smaller and slightly shorter, may fit if space allows Dimensions: 9.37" x 5.06" x 8.75"
Group 40R – Similar in footprint but shorter in height Dimensions: 10.94" x 6.89" x 6.89"

Still unsure? Visit our How It Works page to learn how we help match your battery quickly and correctly.

Signs Your Group 51 Battery Needs Replacing

Even a good battery gives signs when it’s on the way out. Watch for:

Slow or delayed engine cranking
Dashboard battery or check engine light
Voltage reading below 12.4V at rest or under 9.6V while cranking

Need help checking your battery? MobileBattery offers battery testing and replacement right at your home, workplace, or even roadside—in cities like Montreal, Toronto, and Vancouver.

Group 51 Battery Lifespan in Canada

In typical Canadian driving conditions, a Group 51 battery will last about 3 to 5 years. Cold starts, lots of stop-and-go driving, and short trips can reduce lifespan. If your battery is over 3 years old, it's smart to have it tested—especially before winter hits.

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