Group 51R Car Battery

Description

Reliable starting power with the Group 51R flooded lead-acid car battery.  Long-lasting, dependable performance for everyday drivers.

For drivers looking for extra longevity and performance, we also offer the 51R AGM Battery as an easy upgrade.

Compatible Part Numbers

The B51R72 is a compatible replacement for Group 51R car batteries including:

• 51R-550
• 51R-TCX
• MTP-51R
• RNB-51R02

Key Features

• Type: Lead-acid / flooded wet battery
• Cold Cranking Amps (CCA): 475 – strong starting power in cold weather
• Reserve Capacity (RC): 70 minutes @ 25 Amp
• Designed for everyday car owners: Dependable and long-lasting performance
• Durable and reliable: Built to handle daily driving demands

Dimensions

• Length 9.2″ / 234 mm
• Width 5.4″ / 136 mm
• Height 8.7″ / 220 mm
• Weight 28 lbs / 12.5 kg
• SAE Automotive top posts
• Polarity – Positive on the right.  For a reversed terminal see Group 51 Car Battery (positive on the left)

Frequently Asked Questions

What is the difference between a Group 51R and Group 51 battery?
Group 51R and Group 51 batteries have the same physical dimensions, but the key difference is the terminal orientation (polarity). A Group 51R battery has the positive terminal on the right, while a Group 51 battery has the positive terminal on the left.

Why can’t flooded batteries be shipped?
Flooded lead-acid batteries contain liquid acid, which is considered hazardous for transport.  For more details, see our shipping policy.

Do I need to use the same battery size?
Yes – always replace your battery with the same BCI group size (e.g.51R) to ensure proper fit and connection with your vehicle’s terminals.

Can I replace a flooded battery with an AGM?
If your vehicle was originally equipped with a flooded battery, you can often upgrade to an AGM battery for improved performance and longer lifespan. Always check your vehicle’s specifications before switching battery types. Learn more about the 51R AGM.