Group 51 and 51R Batteries: Dimensions, Features, and Recommendations

Group 51 and 51R Batteries: Dimensions, Features, and Recommendations

In automotive batteries, Group 51 and 51R stand out for their reliability and versatility. Popular in both automotive and other applications, these batteries provide consistent power and are adaptable to a range of needs. For Canadian consumers, understanding these batteries' dimensions, features, and optimal usage is crucial for making informed decisions.

Group 51 and 51R Batteries Dimensions and Physical Characteristics

Group 51 and 51R batteries have nearly the same dimensions, typically measuring around 9.3 x 5.1 x 8.7 inches. The main difference lies in the terminal placement: Group 51 batteries have the positive terminal on the left, while Group 51R batteries have it on the right. This distinction is vital for ensuring correct installation in vehicles, and preventing potential connectivity issues or electrical shorts.

Canadian Vehicles using Group 51

In Canada, Group 51 batteries are found in various models of Honda, Toyota, Mazda, Nissan, and Subaru.

  • Honda: Civic, CR-V, Fit, and Accord
  • Toyota: Corolla, Prius, and Yaris
  • Mazda: Mazda3 and Mazda5
  • Nissan: Sentra, Versa, and Juke
  • Subaru: Impreza

Note: Suggest any car or any other vehicle who uses Group 51 and Group51R battery.

These batteries are chosen for their compact size, reliable performance in cold weather, and compatibility with many compact and midsize cars prevalent in the Canadian market.

Key Features

1. Construction and Technology:

Absorbent Glass Mat (AGM): Most Group 51 and 51R batteries utilize AGM technology, known for its enhanced performance in terms of vibration resistance and maintenance-free operation. AGM batteries are spill-proof and can be installed in various orientations.

Sealed Lead Acid (SLA): These batteries are sealed, which reduces the risk of acid leaks and enhances safety and environmental friendliness.

2. Performance Metrics

Capacity (Ah): These batteries generally offer capacities ranging from 38 to 60 ampere-hours (Ah), which determines the duration for which the battery can provide power before needing a recharge.

Cold Cranking Amps (CCA) and Marine Cranking Amps (MCA): Values typically range between 320-450 CCA and 390-575 MCA, indicating the battery’s ability to start an engine in cold temperatures, with higher numbers reflecting better performance.

3. Versatility

Starting Applications: Ideal for vehicle engines, these batteries provide reliable cranking power.

Dual-Purpose: Suitable for both starting and deep-cycle functions, making them versatile for RVs and boats.

Deep-Cycle: Designed for sustained power over extended periods, perfect for off-grid solar systems and marine applications.

Looking to Buy Group 51 and Group 51R Battery? Get in touch with Batteries Store today or call us at +1 (587) 647-4444.

Charging and Maintenance

Proper maintenance is crucial to maximizing the lifespan of Group 51 and 51R batteries. An AGM-compatible charger, such as the NOCO Genius5, ensures the batteries are charged correctly. These smart chargers offer features like battery desulfation and maintenance charging, which help keep the batteries in optimal condition.

Warranty and Support

Warranty and Support Group 51 and 51R batteries typically come with a warranty period that can range from 2 to 5 years, depending on the manufacturer and specific battery model. This warranty often covers defects in materials and workmanship, providing peace of mind to consumers. It is advisable to check the warranty terms and conditions at the time of purchase to understand what is covered.

Customer Support: Most reputable battery manufacturers and retailers offer robust customer support services. This includes assistance with battery selection, installation guidance, troubleshooting, and warranty claims. Access to reliable customer support ensures that any issues or questions can be promptly addressed, enhancing the overall ownership experience.

Comparative Analysis

Comparative Analysis: Group 51/51R vs Other Battery Group

When compared to other popular automotive battery groups, Group 51 and Group 51R batteries offer several unique advantages:

Size and Fit: Group 51 and 51R batteries are more compact than many other battery group, making them ideal for smaller vehicles where space is limited. This compact size does not compromise their power output, making them a reliable choice for a range of applications.

Cold Weather Performance: With CCA ratings between 320-450, these batteries perform well in cold weather, which is crucial for Canadian consumers. This is comparable to, or even better than, other battery groups of similar size.

Versatility: Unlike some batteries that are strictly for starting or deep-cycle use, Group 51 and 51R batteries can often serve dual purposes. This versatility makes them suitable for a variety of applications, from automotive to marine and RV use.


Group 51 and 51R batteries provide versatile and reliable power solutions suitable for various applications. Understanding their dimensions, features, and proper usage helps Canadian consumers make informed decisions. Whether for starting, dual-purpose, or deep-cycle applications, these batteries offer robust performance and durability, making them a trusted choice in both the automotive and industrial sectors.

For purchasing inquiries, contact Batteries Store Calgary today or call us at +1 (587) 647-4444.