---
product_id: 81903514
title: "BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp"
brand: "black+decker"
price: "€ 71.02"
currency: EUR
in_stock: true
category: "Black+Decker"
url: https://www.desertcart.pt/products/81903514-bm3b-fully-automatic-6v-12v-battery-charger-maintainer-with-cable
store_origin: PT
region: Portugal
---

# 1.5 Amp fast charge 6V/12V multi-battery compatibility Built-in circuit protection BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp

**Brand:** black+decker
**Price:** € 71.02
**Availability:** ✅ In Stock

## Summary

> 🔌 Power up smart, stay charged longer!

## Quick Answers

- **What is this?** BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp by black+decker
- **How much does it cost?** € 71.02 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/81903514-bm3b-fully-automatic-6v-12v-battery-charger-maintainer-with-cable)

## Best For

- black+decker enthusiasts

## Why This Product

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

## Key Features

- • **Safety-First Design:** ETL certified with built-in safeguards against overcharging, reverse polarity, and short circuits—charge with confidence.
- • **Compact & Convenient:** Lightweight with a built-in mounting bracket for easy, space-saving placement wherever you need it.
- • **Smart Auto Float Mode:** Automatically stops charging and switches to maintenance mode to keep your battery at peak performance without overcharge.
- • **Universal Voltage Mastery:** Seamlessly charges both 6V and 12V AGM, GEL, and WET batteries for all your vehicles and toys.
- • **Versatile Connection Options:** Includes both battery clips and O-ring terminals for quick, secure, and flexible installation on any battery type.

## Overview

The BLACK+DECKER BM3B is a compact, fully automatic 1.5 Amp battery charger and maintainer designed for 6V and 12V AGM, GEL, and WET batteries. Featuring smart float mode, versatile connection options, and comprehensive circuit protection, it ensures safe, efficient charging for a wide range of vehicles and equipment. ETL certified and backed by a 1-year warranty, it’s the reliable choice for keeping your batteries ready and healthy.

## Description

The BLACK+DECKER BM3B high frequency battery charger and maintainer is used to keep batteries in stored vehicles and battery applications at optimal capacity during the off season. Charges 6 volt and 12 volt AGM, GEL and WET batteries in RVs, specialty vehicles, antique and classic cars, marine deep cycle batteries, motorcycles, lawn mowers, ATVs, snowmobiles, and personal watercrafts. Slide the voltage selector switch to either 6V or 12V depending upon the battery you are charging. Connect the battery charger and maintainer with the included battery clips or battery ring terminals. Charging automatically stops when battery is fully charged or topped off and switches to float mode monitoring to maintain charge. Built-in circuit protection guards against overcharging, reverse polarity, or short circuit and is ETL certified for performance and safety. The BLACK+DECKER BM3B battery charger and maintainer has a built-in mounting bracket for convenient placement and includes a limited 1 year manufacturer warranty.

## Features

- Charges and maintains 12 volt and 6 volt AGM, GEL and WET batteries
- Easy connection to vehicle battery using battery clips or O-ring terminals
- Stops charging automatically when battery is fully charged or topped off, switching to float mode monitoring
- Built-in circuit protection guards against overcharging, reverse polarity, or short circuit; ETL certified for performance and safety
- Mounting bracket built-in to charger for convenient placement
- Fit type: Universal Fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0051D3MP6 |
| Amperage | 1.5 Amps |
| Best Sellers Rank | #22,437 in Automotive ( See Top 100 in Automotive ) #120 in Battery Chargers |
| Brand | BLACK+DECKER |
| Built-In Media | charger |
| Color | Multi |
| Compatible Devices | Vehicles and equipment that use 6V or 12V AGM, GEL, or WET batteries |
| Connector Type Used on Cable | Battery Clips, O-Ring Terminals |
| Current Rating | 1.5 Amps |
| Customer Reviews | 4.4 4.4 out of 5 stars (13,254) |
| EU Spare Part Availability Duration | 10 Years |
| Input Voltage | 12 Volts (AC) |
| Item Dimensions D x W x H | 5"D x 1.6"W x 2.6"H |
| Item Type Name | Battery Maintainer/Trickle Charger |
| Item Weight | 1.2 Pounds |
| Manufacturer | Baccus Global LLC |
| Mfr Part Number | BM3B |
| Model Number | BM3B |
| Number of Ports | 1 |
| Output Voltage | 12 Volts (DC) |
| Specification Met | ETL |
| UPC | 814632012306 885911216357 |
| Unit Count | 1.0 Count |
| Warranty Description | Limited One Year |

## Product Details

- **Brand:** BLACK+DECKER
- **Color:** Multi
- **Item Weight:** 1.2 Pounds
- **Output Voltage:** 12 Volts (DC)
- **Product Dimensions:** 5"D x 1.6"W x 2.6"H

## Images

![BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp - Image 1](https://m.media-amazon.com/images/I/81xP3NK1SmL.jpg)

## Available Options

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

## Questions & Answers

**Q: How is it compare to Axtra 3.6 amp car battery charger?**
A: This is only a 1.2A charger.  Yes, Mr. Krueger, IT IS A BATTERY CHARGER.
The more amperage, the better because a higher amperage charger will charge much quicker.  I really can't believe that there are so many chargers out now with such pathetically low amperages...

**Q: How is Black Decker 1.5 amp battery charger compares to Axtra 3.6-amp battery charger maintainer?**
A: The Black & Decker battery charger has been out a while and gets good ratings. The Axtra 3.6 battery is new but has very good specifications. If you are in an area with wide temperature ranges, the Noco Genius 5 has a temperature sensor so it's operational range is -4 F to 110 F.

**Q: What is the float voltage?  When the charger indicates it is done charging what is the voltage of the battery?**
A: As this is a "true float charger", the maintenance voltage is dependent upon the Full Charge Voltage (FCV) of the battery, which is usually anywhere from 12.6 to 13.2 depending on battery design and how much sulfation has taken place on the internal plates.  Unlike chargers that use a "trickle maintenance mode" with a fixed voltage output, the B&D unit senses when the battery will accept no more current (full charge) and then stops sending voltage and rests until the battery voltage drops below that threshold and then it should "wake up" and start charging again.

**Q: how fast does it charge**
A: Math will tell you.  If it's a 1.5 Amp charger and you're trying to charge a 7 Ah battery, 7/1.5 = 4.7 hours till full charge.  If it's a 50 Ah battery, 33.3 hours till full charge (50/1.5 = 33.3).  But, there's typically about a 20% efficiency loss, so it's really more like 5.6 hours and 40 hours for these examples.However, you may not need full charge if you're wanting to charge a battery that will be installed in a car or bike that has an alternator which will continue to charge it while it's running.  Also, it's not a good idea to use too powerful of a charger to charge the battery quickly.  For example, using a 5 Amp charger on a 2 Ah battery will charge it VERY quickly, but could overheat and shorten the live and cycles of the battery.  Different battery chemistry allows for different charging amps.  But in all cases, low and slow is better for the life of the battery and safety than fast charging.

## Frequently Bought Together

- BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp
- SinLoon Cigarette Lighter SAE Battery Charger Cable,12V 15A Cigarette Lighter Plug to Waterproof SAE Quick Release Adapter Extension Charging Cable with Fuse and LED Light(10FT,3 Meter)

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**Shop now:** [https://www.desertcart.pt/products/81903514-bm3b-fully-automatic-6v-12v-battery-charger-maintainer-with-cable](https://www.desertcart.pt/products/81903514-bm3b-fully-automatic-6v-12v-battery-charger-maintainer-with-cable)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-07-12*