Battery Size Group 51R

Group Size 51R Battery: Compact, Dependable, and Built for Canadian Roads

The Group Size 51R battery is one of the most popular compact batteries in Canada—especially for Japanese vehicles. The “R” in 51R means reversed terminal layout, which is important for vehicles that are wired specifically for this orientation. If you drive a compact car or hybrid, the 51R might be exactly what your vehicle needs to power up reliably in all seasons.

Size, Specs, and Cost in Canada

Group 51R batteries are 12-volt, lightweight, and compact—perfect for tight engine bays. They measure approximately 9.38 inches long, 5.06 inches wide, and 8.75 inches high.

Typical performance specs:

• Cold Cranking Amps (CCA): 410 to 500

• Cranking Amps (CA): 500 to 625

• Amp-Hour (Ah): 35 to 45Ah

In Canada, a Group 51R battery usually costs between $140 and $210, depending on the brand, warranty, and whether it’s a flooded or AGM version. Most options include a 2- to 3-year free replacement warranty, which gives everyday drivers peace of mind.

Vehicles That Use Group 51R Batteries

You’ll find Group 51R batteries in many small to mid-size Japanese and Korean cars, such as:

• Honda Civic (2006–2021)

• Honda Fit

• Toyota Yaris

• Nissan Versa, Cube, and Sentra

• Mazda 2 and Mazda 3 (select trims)

• Hyundai Accent and Kia Rio

If you're unsure if your car uses a 51R, visit our Car Battery Replacement page or check your vehicle’s owner’s manual.

Alternative Battery Sizes for Group 51R

Can’t find a 51R battery? Here are some nearby alternatives—but make sure to confirm terminal layout and tray size first:

• Group 51 – Identical in size but with standard (non-reversed) terminals Dimensions: 9.38" x 5.06" x 8.75"

• Group 151R – Slightly smaller and narrower; fits some models with adjustment Dimensions: 9.38" x 5.06" x 8.75"

• Group 40R – Similar footprint and reversed terminal layout; slightly shorter Dimensions: 10.94" x 6.89" x 6.89"

Before you choose an alternate group, it’s best to check battery tray measurements and cable length. Learn more at How It Works.

How to Know If Your 51R Battery Needs Replacing

Here are some signs that your 51R battery might be reaching the end of its life:

1. The engine cranks slowly or hesitates when starting

2. Headlights flicker or dim when you turn the key

3. Battery light appears on the dashboard

4. Voltage drops below 12.4V when the engine is off, or below 9.6V while cranking

If you’re not sure how to test it, MobileBattery offers mobile battery testing and roadside replacement in cities like Toronto, Calgary, and Vancouver.

Battery Lifespan in Canadian Conditions

A Group 51R battery typically lasts 3 to 5 years in Canada. Cold temperatures, short drives, and heavy accessory use (wipers, lights, heated seats) can shorten its life. After three years, it’s smart to test your battery before the winter season starts.

To see if we service your city, visit our Where We Service page.

Need a Group Size 51R Battery Replacement?

Book online now at bookonline.mobilebattery.ca for fast, expert Group 51R battery installation at your home, office, or roadside—anywhere in Canada.