---
product_id: 7352946
title: "OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery"
brand: "optima"
price: "R32135"
currency: ZAR
in_stock: true
reviews_count: 10
category: "Optima"
url: https://www.desertcart.co.za/products/7352946-optima-batteries-d31m-bluetop-boat-and-rv-dual-purpose-sealed
store_origin: ZA
region: South Africa
---

# 155 min Reserve Capacity SpiralCell Tech for max power 900 Cold Cranking Amps OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery

**Brand:** optima
**Price:** R32135
**Availability:** ✅ In Stock

## Summary

> ⚡ Power your adventures with OPTIMA® — where endurance meets instant ignition!

## Quick Answers

- **What is this?** OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery by optima
- **How much does it cost?** R32135 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/7352946-optima-batteries-d31m-bluetop-boat-and-rv-dual-purpose-sealed)

## Best For

- optima enthusiasts

## Why This Product

- Trusted optima brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Built to Endure:** 15x more vibration resistant and up to 3x longer lifespan than standard flooded batteries—reliability that keeps pace with your adventures.
- • **Dual-Purpose Dynamo:** Designed for both deep cycle and starting needs, perfect for high-demand marine and RV electrical systems.
- • **Unstoppable Power Start:** 900 CCA ensures your boat or RV fires up instantly, even in the coldest mornings.
- • **Maintenance-Free Freedom:** Spillproof and mountable in any position, so you focus on the journey, not battery upkeep.
- • **Next-Level SpiralCell Tech:** 99.99% pure lead spiral cells deliver cleaner, longer-lasting energy that outperforms flat-plate batteries.

## Overview

The OPTIMA® D31M BLUETOP® is a 12-volt, dual-purpose AGM battery delivering 900 cold cranking amps and 155 minutes of reserve capacity. Featuring advanced SpiralCell technology with 99.99% pure lead, it offers superior starting power, exceptional vibration resistance, and up to three times longer life than standard flooded batteries. Maintenance-free and spillproof, it’s engineered for demanding boat and RV applications requiring reliable, long-lasting energy.

## Description

The OPTIMA D31M BLUETOP is designed as a dual purpose battery, both starting and deep cycle for people who need a sure-starting, strong cranking, and maintenance free power source for their boat or RV, even in harsh conditions. The unique spiral cell design provides a strong and clean power source, ensuring the safety of you, your family and the environment. The higher reserve capacity gives you a longer shelf-life to give you the power when you need it, where you need it. This battery is designed to be used with recreational vehicles or boats with large accessory loads. Refer to the user guide for troubleshooting steps. Up to 3x longer life and maintenance-free. Spillproof, mountable in virtually any position. More than 15 times the vibration resistance of standard flooded batteries. Best choice for supporting high electrical demands.

Review: Optima are Great Batteries; I have a feeling that most of ... - These batteries are Often advertised as maintenance free; But they DO Require a VERY MINIMUM Amount of Maintenance to keep them up to Snuff; for when the Boat (or) RV Usage season returns each year. Optima are Great Batteries; I have a feeling that most of the people giving bad reviews on this battery Do Not have an understanding of the design of 12-volt batteries. most 12-volt batteries are NEVER EVER Suppose to go under 50% charge; before being recharged again. For these BLUE-TOP Optima Batteries State of charge is as follows: 100% = 13.18 volts 75% = 12.69 volts ( down to 75 percent they may be recharged 750 times) 50% = 12.28 volts ( down to 50 percent they may be recharged 600 times) Lastly THESE Particular 12-volt batteries are NEVER EVER suppose to go under 12.00-volts and WHEN (and) if these Blue Top Batteries ever go down to 11.72-volts they MAY ONLY last for 450 or less charging cycles. THAT IS WHY: During the OFF-Season when these batteries are NOT Being used; they either 1.) Need to be charged at the least 2 times over the winter with either Battery Tender Charger Part No. 021-0128 (or) 2.) Or put the 15-watt battery tender solar panel with built-in charge controller on these batteries. which is Battery Tender Part No: 021-1165
Review: Top Quality - Optima batteries are one of the best on the market. I am very impressed by their longevity and high power delivery. I have had a yellow top Optima in my 4wd truck for 9 years now and it is as strong as the day I installed it. Other great features of Optima batteries are the facts that you never have to add water, they can be mounted in most any position and the terminals never corrode. This purchase was a second blue top D31M. I use two of these batteries in parallel to power a 2000 watt inverter. I tested it by placing a 1500 watt load on the inverter which drew 137.5 amps from the two batteries in parallel. They were able to sustain this load for 27 minutes. That is like cranking a 6 cylinder engine for half an hour. I previously used marine deep-cycle flooded-cell batteries for my inverter but they would only last about two years and I constantly had to check and add water as well as clean corrosion from the terminals. The bottom line is even though you pay more initially to buy an Optima battery the long life and power delivery quality actually make it cheaper than other batteries when you divide the cost by the number of years of service.

## Features

- BATTERY SPECS: 12-Volt, 900 Cold Cranking Amps, Size: 12.81" Length x 6.56" Wide x 9.38" Tall, Weight: 59.8 pounds, Dual SAE & 5/16" Stainless Steel Stud Posts, C20 Capacity: 75 AH, MCA 1125
- RESERVE CAPACITY of 155 minutes for constant performance. Faster charging capabilities.
- SPIRALCELL TECHNOLOGY: SPIRALCELL TECHNOLOGY with 99.99% pure lead delivers more power and consistently outperforms conventional flat-plate batteries. Optimal starting power even in bad weather.
- LONG LASTING: Fifteen times more resistant to vibration than standard flooded battieres for durability and Up to 3 times longer life vs. standard flooded batteries.
- DUAL PURPOSE & MAINTENANCE FREE: Dual purpose for both deep cycle and starting applications. Maintenance Free for maxium convenience.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00099DW6G |
| Automotive Fit Type | Vehicle Specific Fit |
| Battery Cell Composition | Lead Acid |
| Battery Type | Lead Acid |
| Best Sellers Rank | #206,682 in Automotive ( See Top 100 in Automotive ) #542 in Automotive Replacement Batteries |
| Brand | OPTIMA |
| Brand Name | OPTIMA |
| Compatible with Vehicle Type | Boat |
| Customer Reviews | 4.2 out of 5 stars 456 Reviews |
| Global Trade Identification Number | 00811405001611 |
| Included Components | battery |
| Item Dimensions D x W x H | 6.5"D x 12.81"W x 9.38"H |
| Item Highlight | High Performance Deep Cycle and Starting Battery, 900 CCA, Dual Terminal, Maintenance Free, Versatile Mounting |
| Item Type Name | lead_acid_battery |
| Item Weight | 59.8 pounds |
| Manufacturer | OPTIMA |
| Manufacturer Part Number | 8052161 |
| Manufacturer Warranty Description | See manufacturer |
| Model Number | 8052-161 |
| Number of Items | 1 |
| Size | 12-13/16 x 6-1/2 x 9-3/8 inch |
| Terminal | SAE Terminal |
| UPC | 811405001611 721112819839 |
| Unit Count | 1 Count |
| Vehicle Service Type | Boat |
| Voltage | 12 volts |

## Product Details

- **Battery Cell Composition:** Lead Acid
- **Brand:** OPTIMA
- **Item Weight:** 59.8 pounds
- **Product Dimensions:** 6.5"D x 12.81"W x 9.38"H
- **Size:** 12-13/16 x 6-1/2 x 9-3/8 inch
- **Terminal:** SAE Terminal
- **Unit Count:** 1 Count
- **Vehicle Service Type:** Boat
- **Voltage:** 12 volts

## Images

![OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery - Image 1](https://m.media-amazon.com/images/I/71IwonCRUSL.jpg)
![OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery - Image 2](https://m.media-amazon.com/images/I/616XofgHDlL.jpg)
![OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery - Image 3](https://m.media-amazon.com/images/I/61h7YF62EOL.jpg)
![OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery - Image 4](https://m.media-amazon.com/images/I/71emeBCFdeL.jpg)
![OPTIMA® Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery - Image 5](https://m.media-amazon.com/images/I/61OBiEADrUL.jpg)

## Available Options

This product comes in different **Customer Package Type** options.

## Questions & Answers

**Q: What does the "Amp-Hour" rating of this battery translate to in deep-cycle mode?**
A: For trolling motor use you would divide the current draw of the motor into the number of amp hours to find out how long the battery would perform at that level.

**Q: Does this come with any 5/16 wing nuts for the studs or something's similar?**
A: Yes it does.  I'd have to go check, but I think it has a 3/8" stud for the positive and 5/16" for the negative, along with standard battery posts.

**Q: Can this be mounted on its side?**
A: Yes no acid

**Q: I hear these batteries are damaged if they go below 80% charge, is there a guarantee I will receive a fully charged battery?**
A: My boat mechanic is a optima dealer he told me a standard battery charger will never get the battery to full charge you need to get a optima charger. I had a battery that wouldn’t charge. I used the optima charger and it finally got a full charge.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Optima are Great Batteries; I have a feeling that most of ...
*by F***K on June 16, 2016*

These batteries are Often advertised as maintenance free; But they DO Require a VERY MINIMUM Amount of Maintenance to keep them up to Snuff; for when the Boat (or) RV Usage season returns each year. Optima are Great Batteries; I have a feeling that most of the people giving bad reviews on this battery Do Not have an understanding of the design of 12-volt batteries. most 12-volt batteries are NEVER EVER Suppose to go under 50% charge; before being recharged again. For these BLUE-TOP Optima Batteries State of charge is as follows: 100% = 13.18 volts 75% = 12.69 volts ( down to 75 percent they may be recharged 750 times) 50% = 12.28 volts ( down to 50 percent they may be recharged 600 times) Lastly THESE Particular 12-volt batteries are NEVER EVER suppose to go under 12.00-volts and WHEN (and) if these Blue Top Batteries ever go down to 11.72-volts they MAY ONLY last for 450 or less charging cycles. THAT IS WHY: During the OFF-Season when these batteries are NOT Being used; they either 1.) Need to be charged at the least 2 times over the winter with either Battery Tender Charger Part No. 021-0128 (or) 2.) Or put the 15-watt battery tender solar panel with built-in charge controller on these batteries. which is Battery Tender Part No: 021-1165

### ⭐⭐⭐⭐⭐ Top Quality
*by J***R on August 15, 2007*

Optima batteries are one of the best on the market. I am very impressed by their longevity and high power delivery. I have had a yellow top Optima in my 4wd truck for 9 years now and it is as strong as the day I installed it. Other great features of Optima batteries are the facts that you never have to add water, they can be mounted in most any position and the terminals never corrode. This purchase was a second blue top D31M. I use two of these batteries in parallel to power a 2000 watt inverter. I tested it by placing a 1500 watt load on the inverter which drew 137.5 amps from the two batteries in parallel. They were able to sustain this load for 27 minutes. That is like cranking a 6 cylinder engine for half an hour. I previously used marine deep-cycle flooded-cell batteries for my inverter but they would only last about two years and I constantly had to check and add water as well as clean corrosion from the terminals. The bottom line is even though you pay more initially to buy an Optima battery the long life and power delivery quality actually make it cheaper than other batteries when you divide the cost by the number of years of service.

### ⭐ 2yr Battery UGWU$4
*by A***R on October 18, 2024*

Purchased 09/16/2022, NEW, to replace an old Dual Marine NON-AGM Battery that was 6yrs old. Did hours of reading and research and reviews before we made the decision to purchase this Blue Top AGM Battery from Optima. We weren't able to get the boat in the water in 2023 due to my FNL having medical issues, so we kept it on a battery tender and then April of 2024 we put in the boat, 2012 Hurricane SunSport 202 w/Evinrude E-Tec 200HP OB and it ran great all spring and Summer. We pull the boat out approximately 4 weeks ago and noticed battery was week and it says it has a dead cell and won't charge completely. Will not purchase another battery from Optima and will go back to a traditional marine battery with much greater life expectancy. Spending more money for what would seem to be the "best" AGM battery for our application turned out to not be the case. Thanks, Optima, for a subpar performing product. Sincerely UGWU$4

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-10-07*