--- product_id: 744695202 title: "Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel" brand: "renogy rego" price: "€ 412.43" currency: EUR in_stock: true reviews_count: 5 category: "Renogy Rego" url: https://www.desertcart.gr/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage store_origin: GR region: Greece --- # 40A high-current output Bluetooth remote monitoring (BT-2) 4-stage smart charging algorithm Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel **Brand:** renogy rego **Price:** € 412.43 **Availability:** ✅ In Stock ## Summary > ⚡ Power up your adventure with smart, fast, and fearless charging! ## Quick Answers - **What is this?** Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel by renogy rego - **How much does it cost?** € 412.43 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage) ## Best For - renogy rego enthusiasts ## Why This Product - Trusted renogy rego brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Smart Alternator Protection:** Built-in alternator detection safeguards your starter battery by charging only when the engine runs—no more unexpected drains. - • **Seamless Bluetooth Monitoring:** Add the BT-2 module to control charging current and track real-time data remotely via the Renogy DC Home app—stay connected, always. - • **Rugged, Compact Wall-Mount Design:** Corrosion-resistant and compact for tight spaces—perfect for boats, RVs, and off-grid setups in harsh environments. - • **Tailored 4-Stage Charging Profiles:** Automatically optimizes Bulk, Boost, Float, and Equalization stages for your battery type, ensuring peak performance and longevity. - • **Turbocharge Your Auxiliary Batteries:** Delivers a powerful 40A output to revive and maintain AGM, GEL, and Lithium batteries faster than ever. ## Overview The Renogy REGO 12V 40A DC-DC Battery Charger is a robust, alternator-powered charger designed for RVs, boats, and vans with auxiliary batteries. It features a 4-stage smart charging algorithm compatible with AGM, GEL, and Lithium batteries, built-in alternator detection to protect starter batteries, and a corrosion-resistant compact wall-mount design. Optional Bluetooth monitoring via the BT-2 module enables real-time charging control and data logging, making it an essential upgrade for off-grid and mobile power management. ## Description 𝐑𝐄𝐍𝐎𝐆𝐘 40A DC-DC Charger turbo-charges RV/boat batteries 2x faster—revive dead LiFePO4 with one-touch Savior Mode! Perfect for liveaboard yachts or off-grid cabins, this 12V DC to DC charger supports AGM/GEL/custom lithium. Survive salt spray and blizzards with IP32 armored casing and military-grade reverse polarity protection. Monitor 40A charging currents remotely via App (RJ485/BT-2). Smart alternator compatibility (12-16V) prevents starter drain, while arctic-proof design (-13℉ to 140℉) auto-throttles output above 113℉. With ＜15mA standby drain, never wake to dead batteries in overlanding rigs. Trusted by Pacific fishermen and Alaskan truckers Review: Game changer - Game changer. I have two 100amp batteries that I thought I was getting a good charge and management out of what I had. I learned quickly that this is a necessity. Review: Worked only once - It worked one time. Shows it’s connected but doesn’t charger aux batteries. ## Features - 𝐈𝐦𝐩𝐨𝐫𝐭𝐚𝐧𝐭: 𝐀𝐥𝐭𝐞𝐫𝐧𝐚𝐭𝐨𝐫-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 – 𝐍𝐎 𝐬𝐨𝐥𝐚𝐫 𝐢𝐧𝐩𝐮𝐭. 𝐅𝐨𝐫 𝐑𝐕𝐬/𝐯𝐚𝐧𝐬/𝐛𝐨𝐚𝐭𝐬 𝐰𝐢𝐭𝐡 𝐚𝐮𝐱𝐢𝐥𝐢𝐚𝐫𝐲 𝐛𝐚𝐭𝐭𝐞𝐫𝐲 (𝐧𝐨𝐭 𝐟𝐨𝐫 𝐬𝐭𝐚𝐧𝐝𝐚𝐫𝐝 𝐜𝐚𝐫𝐬). 𝐔𝐬𝐞 𝟖 𝐀𝐖𝐆 𝐜𝐚𝐛𝐥𝐞 ≤ 𝟑𝐦 𝐟𝐨𝐫 𝟒𝟎𝐀 𝐨𝐮𝐭𝐩𝐮𝐭 (𝐥𝐨𝐧𝐠𝐞𝐫 𝐜𝐚𝐮𝐬𝐞𝐬 𝐬𝐡𝐮𝐭𝐝𝐨𝐰𝐧). 𝐁𝐓-𝟐 𝐫𝐞𝐪𝐮𝐢𝐫𝐞𝐝 𝐟𝐨𝐫 𝐜𝐮𝐫𝐫𝐞𝐧𝐭 𝐚𝐝𝐣𝐮𝐬𝐭𝐦𝐞𝐧𝐭. - 【Alternator Detection – Starter Protection】12V DC to DC battery charger features built-in alternator running detection, ensuring charging only occurs when the engine is running – protecting your starter battery from over-discharge. The charger instantly adjusts its mode during vehicle startup, guaranteeing no harm to your starter battery. For smart alternator vehicles, connect the included IGN signal wire for proper operation. - 【4-Stage Smart Charging – AGM/GEL/Flooded/LiFePO4】 Renogy Rego DC battery charger delivers a complete 4-stage charging algorithm (Bulk → Boost → Float → Equalization) optimized for your battery type. The DC to DC charger 12V automatically selects the ideal profile via front-panel button. LiFePO4 batteries use Bulk + Boost only – float and equalization are disabled for lithium safety. LiFePO4 must have a built-in BMS. - 【Compact Wall-Mount – Corrosion-Proof & Safe】Renogy Rego 40A DC-DC battery charger features a second-generation wall-mount design with corrosion-resistant construction – suitable for boat cabins and humid environments. Its internal layout keeps input and output terminals safely spaced to prevent short circuits. Note: Not waterproof – mount in a dry, shaded location away from water and direct sunlight. - 【Complete Electronic Protection】DC to DC LiFePO4 charger adopts advanced protection against overload, short circuits, over-temperature, over-voltage, and reverse polarity. In high-temperature environments, it intelligently reduces output power for safe and efficient charging. - 【Bluetooth Monitoring – BT-2 Sold Separately】Add the BT-2 Bluetooth module (sold separately) to adjust charging current, monitor real-time data via the Renogy DC Home app, and access up to 365 days of historical logs. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0FBGF7TYH | | Amperage | 40 A | | Best Sellers Rank | #85,410 in Automotive ( See Top 100 in Automotive ) #385 in Battery Chargers | | Brand | RENOGY REGO | | Color | Black | | Compatible Devices | AGM, GEL, Lithium, Remote Monitoring Devices (RJ485, Bluetooth) | | Connector Type Used on Cable | RJ485, Bluetooth (BT-2) | | Current Rating | 40 A | | Customer Reviews | 3.6 out of 5 stars 14 Reviews | | Input Voltage | 16 volts | | Item Dimensions D x W x H | 2.3"D x 9.31"W x 5.17"H | | Manufacturer | RENOGY Rego | | Mfr Part Number | RBC40D1U | | Model Number | 40A Fast Charge | | Number of Items | 1 | | Output Voltage | 12 volts_of_direct_current | | Product Dimensions | 2.3"D x 9.31"W x 5.17"H | | Specification Met | UL | | Unit Count | 1 Count | | Warranty Description | 2-year material and workmanship warranty | ## Product Details - **Brand:** RENOGY REGO - **Color:** Black - **Output Voltage:** 12 Volts (DC) - **Product Dimensions:** 2.3"D x 9.31"W x 5.17"H - **Specification Met:** UL ## Images ![Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel - Image 1](https://m.media-amazon.com/images/I/515q7rAKn-L.jpg) ![Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel - Image 2](https://m.media-amazon.com/images/I/71PrcW5N5bL.jpg) ![Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel - Image 3](https://m.media-amazon.com/images/I/71M+FR2LvRL.jpg) ![Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel - Image 4](https://m.media-amazon.com/images/I/61LG79C6R8L.jpg) ![Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel - Image 5](https://m.media-amazon.com/images/I/71zM1Et9OeL.jpg) ## Available Options This product comes in different **Model** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Game changer *by M***E on November 3, 2025* Game changer. I have two 100amp batteries that I thought I was getting a good charge and management out of what I had. I learned quickly that this is a necessity. ### ⭐ Worked only once *by A***T on August 17, 2026* It worked one time. Shows it’s connected but doesn’t charger aux batteries. ### ⭐⭐⭐⭐⭐ Good *by T***A on February 1, 2026* Does it’s job --- ## 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.gr/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage](https://www.desertcart.gr/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-08-21*