--- product_id: 7352946 title: "Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery" brand: "optima" price: "R31877" currency: ZAR in_stock: true category: "Optima" url: https://www.desertcart.co.za/products/7352946-batteries-d31m-bluetop-boat-and-rv-dual-purpose-sealed-agm store_origin: ZA region: South Africa --- # 155 min Reserve Capacity SpiralCell Tech for max power 900 Cold Cranking Amps Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery **Brand:** optima **Price:** R31877 **Availability:** ✅ In Stock ## Summary > ⚡ Power your adventures with OPTIMA® — where endurance meets instant ignition! ## Quick Answers - **What is this?** Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery by optima - **How much does it cost?** R31877 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-batteries-d31m-bluetop-boat-and-rv-dual-purpose-sealed-agm) ## 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. ## 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 Type | Lead Acid | | Best Sellers Rank | #80,976 in Automotive ( See Top 100 in Automotive ) #280 in Automotive Replacement Batteries | | Brand Name | OPTIMA | | Compatible with Vehicle Type | Boat | | Customer Reviews | 4.2 4.2 out of 5 stars (455) | | 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 | | 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 ![Batteries D31M BLUETOP® Boat and RV Dual Purpose Sealed AGM Battery - Image 1](https://m.media-amazon.com/images/I/71IwonCRUSL.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. ## Frequently Bought Together - OPTIMA Batteries High Performance D31M BlueTop Dual Purpose Deep Cycle and Starting Sealed AGM Boat and RV Battery, 900 CCA, Dual Terminal, Maintenance Free, Versitile Mounting - T-H Marine Optima Battery D27M and D31M Series Tray Holder with Poly Strap - Rugged Replacement Battery Box is UV and Corrosion Resistant - 8 Mounting Slots - OPTIMA Batteries High Performance D27M BlueTop Dual Purpose Deep Cycle and Starting Sealed AGM Boat and RV Battery, 800 CCA, Dual Terminal, Maintenance Free, Versitile Mounting --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/7352946-batteries-d31m-bluetop-boat-and-rv-dual-purpose-sealed-agm](https://www.desertcart.co.za/products/7352946-batteries-d31m-bluetop-boat-and-rv-dual-purpose-sealed-agm) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-09-27*