Group 51R Batteries

The BCI Group 51R battery is a compact yet powerful 12V solution found in a wide range of popular vehicles, particularly from Japanese manufacturers like Honda, Nissan, and Mazda. The "R" in 51R indicates a reversed terminal layout, which is essential for vehicles where cable reach is precisely engineered for a specific post orientation.

At Battery Mart, we provide premium upgrades that offer significantly more reliability than a standard 51R auto battery. Whether you are looking for the rugged, spill-proof design of the Deka Intimidator AGM or the ultra-lightweight, high-tech performance of the Antigravity Lithium RE-START battery, our selection ensures your vehicle stays powered through every season.

The BCI Group 51R battery is a compact yet powerful 12V solution found in a wide range of popular vehicles, particularly from Japanese manufacturers like Honda, Nissan, and Mazda. The "R" in 51R indicates a reversed terminal layout, which is essential for vehicles where cable reach is precisely engineered for a specific post orientation.

At Battery Mart, we provide premium upgrades that offer significantly more reliability than a standard 51R auto battery. Whether you are looking for the rugged, spill-proof design of the Deka Intimidator AGM or the ultra-lightweight, high-tech performance of the Antigravity Lithium RE-START battery, our selection ensures your vehicle stays powered through every season.

DEKA Intimidator 9A51RT Group 51R AGM Battery
Item #: SLA-9A51R  |    

DEKA Intimidator 9A51RT Group 51R AGM Battery

Made in USA MADE IN USA

DEKA Intimidator 9A51RT Group 51R AGM Battery

Item #: SLA-9A51R
 
Voltage: 12 Volt / 46 Ah / 500 CCA
• AGM
• Dimensions: 9.31" / 5.00" / 8.63"
• Weight: 31.50 lbs
• Warranty: 30 Month
• See All Compatible Models
Price:
$224.95
Price: $224.95
QTY:
Antigravity Group 51R Lithium Car Battery (30Ah)
Item #: AG-51R-30-RS  |    

Antigravity Group 51R Lithium Car Battery (30Ah)

Antigravity Group 51R Lithium Car Battery (30Ah)

Item #: AG-51R-30-RS
 
Voltage: 12.8 Volt / 30 Ah / 1200 CCA
• LiFePO4
• Dimensions: 9.4" / 5.2" / 8.6"
• Weight: 12.70 lbs
• Warranty: 5 Year Factory Direct - Warranty Info (PDF)
• See All Compatible Models
Price:
$949.99
Price: $949.99
QTY:

Understanding Group Size 51R Battery Specifications

When searching for a Group 51R car battery, it is important to distinguish it from the standard Group 51. While the dimensions are similar, the reversed polarity of the 51R is necessary to prevent installation issues and potential electrical damage in vehicles designed for this specific terminal layout.

Group 51R Battery Dimensions

For those checking a 51R battery size equivalent or fitment, the standard dimensions are approximately:

  • Length: 9.38 inches (238 mm)
  • Width: 5.06 inches (129 mm)
  • Height: 8.75 inches (223 mm)

High-Performance 51R Battery Options

Our curated inventory focuses on advanced chemistries that outperform traditional flooded cells in both longevity and cranking power:

  • Deka Intimidator 9A51RT AGM: The Deka 9A51RT is a premier American-made AGM battery. It features a completely sealed, maintenance-free design that is twice as durable as standard 51R batteries. Its superior vibration resistance makes it an excellent choice for daily drivers and enthusiasts alike who want a "set it and forget it" power solution.
  • Antigravity AG-51R-30-RS Lithium: For those looking to shed weight and add modern features, the Antigravity Lithium 51R is the ultimate upgrade. It provides incredible cranking power while weighing roughly 70% less than a lead-acid battery. Most importantly, it features "RE-START" technology—a built-in jump-starting feature that ensures you’re never stranded if your lights are left on.

Why Upgrade Your 51R Car Battery?

Most factory-installed batteries are basic flooded lead-acid models. Upgrading to a premium AGM or LiFePO4 51R from Battery Mart offers several advantages:

  • Enhanced Cold Starts: Higher Cold Cranking Amps (CCA) mean more reliable starts in freezing temperatures.
  • Maintenance-Free Design: No more checking water levels or cleaning acid corrosion from your terminals.
  • Longer Cycle Life: Both our AGM and Lithium options are designed to handle more discharge/recharge cycles, providing a better long-term return on investment.

Finding the Right 51R Battery

Whether you're looking for a dependable 51R auto replacement or a high-performance racing upgrade, we have the right fit. If you prioritize value and ruggedness, the Deka Intimidator is the industry standard. If you want the most advanced, lightweight technology available today, the Antigravity Lithium is the perfect choice for your 51R application.