---
product_id: 744695202
title: "Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel | Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel"
brand: "renogy rego"
price: "47248 kr"
currency: ISK
in_stock: true
reviews_count: 7
category: "Renogy Rego"
url: https://www.desertcart.is/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage
store_origin: IS
region: Iceland
---

# 40A high-current output 4-stage smart charging algorithm Advanced multi-protection system Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel | Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel

**Brand:** renogy rego
**Price:** 47248 kr
**Availability:** ✅ In Stock

## Summary

> ⚡ Power up your off-grid lifestyle with smart, fast, and safe charging!

## Quick Answers

- **What is this?** Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel | Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel by renogy rego
- **How much does it cost?** 47248 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/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

- • **Bluetooth Monitoring Ready:** Add the BT-2 module to remotely adjust charging current, monitor real-time data, and access up to a year of charging history via the Renogy DC Home app.
- • **Rugged, Compact Wall-Mount Design:** Corrosion-resistant and compact for tight spaces—ideal for marine and humid environments, with safe terminal spacing to prevent shorts.
- • **Tailored 4-Stage Charging Profiles:** Automatically optimizes Bulk, Boost, Float, and Equalization stages for your battery type, with lithium-specific safety modes for ultimate battery longevity.
- • **Turbocharge Your Auxiliary Battery:** Delivers a powerful 40A output to rapidly revive and maintain lithium, AGM, and GEL batteries—perfect for RVs, boats, and off-grid adventures.
- • **Smart Alternator & Starter Protection:** Built-in alternator detection ensures charging only when the engine runs, safeguarding your starter battery from drain and damage.

## Overview

The Renogy REGO 12V 40A DC-DC Battery Charger is a robust, alternator-powered charger designed for auxiliary batteries in RVs, boats, and vans. It features a 4-stage smart charging algorithm compatible with lithium, AGM, and GEL batteries, built-in alternator detection to protect starter batteries, and advanced electronic protections. Its compact, corrosion-resistant design suits harsh environments, while optional Bluetooth monitoring offers real-time control and data logging. Ideal for professionals and adventurers seeking reliable, efficient battery management on the go.

## 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: Battery charger - Charge lithium house batteries with alternator.
Review: Avoid buying - Charger only runs for 5 minutes when you first turn the vehicle on then stops charging until you restart the vehicle. Renogy cs says it’s because I don’t have Renogy batteries. Do yourself a favor and steer clear of Renogy. Victron is miles better for the same price.

## 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 | #155,155 in Automotive ( See Top 100 in Automotive ) #613 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 | 3.5 out of 5 stars 16 Reviews |
| Input Voltage | 16 volts |
| Item Dimensions D x W x H | 2.3"D x 9.31"W x 5.17"H |
| Item Highlight | Renogy REGO 12V 40A DC-DC Battery Charger Multi-Stage for Lithium/AGM/Gel |
| 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_of_direct_current
- **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 | 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)

## Available Options

This product comes in different **Model** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Battery charger
*by G***Y on September 5, 2026*

Charge lithium house batteries with alternator.

### ⭐ Avoid buying
*by W***S on August 22, 2026*

Charger only runs for 5 minutes when you first turn the vehicle on then stops charging until you restart the vehicle. Renogy cs says it’s because I don’t have Renogy batteries. Do yourself a favor and steer clear of Renogy. Victron is miles better for the same price.

### ⭐⭐⭐⭐⭐ Good
*by T***A on February 1, 2026*

Does it’s job

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**Shop now:** [https://www.desertcart.is/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage](https://www.desertcart.is/products/744695202-renogy-rego-12v-40a-dc-dc-battery-charger-multi-stage)

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-09-11*