OPTIMA BlueTop D31M AGM Marine Battery

Description

The OPTIMA BlueTop D31M (8052-161) is a premium AGM marine battery engineered for both starting and deep cycle applications. Featuring OPTIMA’s exclusive SpiralCell design with 99.99% pure lead, it delivers powerful cranking performance, increased capacity, and long-lasting durability.

As a Group 31 battery, the D31M offers higher capacity than smaller marine batteries, making it ideal for boats with multiple electronics, trolling motors, and demanding onboard power needs.

Looking for a smaller option? View the OPTIMA BlueTop D27M here.

Key Features

• Dual purpose design – starting and deep cycle marine battery
• 900 Cold Cranking Amps (CCA)
• 1125 Marine Cranking Amps (MCA)
• 75Ah capacity for extended deep cycle use
• 155 minutes Reserve Capacity
• Exclusive SpiralCell technology with 99.99% pure lead
• Up to 3x more recharge cycles than standard flooded batteries
• More than 15x vibration resistance
• Maintenance-free, spill-proof AGM design
• Mountable in virtually any position (except inverted)

Specifications

• Group Size: 31
• Voltage: 12V
• Cold Cranking Amps (CCA): 900
• Marine Cranking Amps (MCA): 1125
• Capacity: 75Ah
• Reserve Capacity: 155 minutes
• Terminal Type: Dual Marine Terminals (SAE Post & 5/16″ Stud)
• Chemistry: AGM (Absorbent Glass Mat)

Dimensions & Weight

• Length: 12.81″ (326 mm)
• Width: 6.56″ (167 mm)
• Height: 9.38″ (239 mm)
• Weight: 60 lbs (27.2 kg)

Common Applications

• Marine starting and deep cycle applications
• Boats with trolling motors and heavy accessory loads
• Fishing boats and larger recreational vessels
• High-demand marine electrical systems

FAQs

Is the OPTIMA D31M a starting or deep cycle battery?
It is a dual-purpose marine battery designed for both engine starting and deep cycle use for onboard electronics and accessories.

What is the advantage of a Group 31 battery?
Group 31 batteries offer higher capacity and longer runtime compared to smaller group sizes, making them ideal for boats with greater power demands.

What terminals does the D31M have?
The D31M features dual marine terminals, including SAE posts and 5/16″ threaded studs for flexible installation.

Is this battery maintenance-free?
Yes, this is a sealed AGM battery and does not require water top-ups. However, it should be kept properly charged, especially during periods of inactivity.