Group 51 Car Battery

Description

Get reliable performance with the Group 51 flooded lead-acid car battery.  It provides long-lasting, dependable performance for everyday drivers.

Compatible Part Numbers

The B5172 is a compatible replacement for Group 51 car batteries including:

• 51-530
• MTP-51
• RNB-5102
• 51-TCX

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, 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 left.  For a reversed terminal see Group 51R Car Battery (positive on the right)

Frequently Asked Questions

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

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.51) to ensure proper fit and connection with your vehicle’s terminals.