---
product_id: 253538339
title: "Black & Decker BM3B 6V and 12V Automatic Battery Charger/Maintainer"
brand: "black+decker"
price: "₨23423"
currency: LKR
in_stock: true
url: https://www.desertcart.lk/products/253538339-black-and-decker-bm3b-6v-and-12v-automatic-battery-charger
store_origin: LK
region: Sri Lanka
---

# Intelligent charging tech 6V/12V compatibility Easy connection options Black & Decker BM3B 6V and 12V Automatic Battery Charger/Maintainer

**Brand:** black+decker
**Price:** ₨23423
**Availability:** ✅ In Stock

## Summary

> 🔌 Power Up Your Ride with Ease!

## Quick Answers

- **What is this?** Black & Decker BM3B 6V and 12V Automatic Battery Charger/Maintainer by black+decker
- **How much does it cost?** ₨23423 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.lk](https://www.desertcart.lk/products/253538339-black-and-decker-bm3b-6v-and-12v-automatic-battery-charger)

## 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

- • **Charge with Confidence:** Effortlessly maintain your 6V and 12V batteries with this versatile charger.
- • **Automatic Mode Switching:** Seamlessly transitions between charge monitoring and float mode for hassle-free use.
- • **Smart Charging Technology:** Experience intelligent high-frequency charging that optimizes battery life.
- • **Integrated Mounting Bracket:** Keep your workspace organized and efficient with a built-in mounting solution.
- • **Versatile Connection Options:** Connect easily with included clamps, eyelet terminals, or DC connector.

## Overview

The Black & Decker BM3B is a reliable automatic battery charger and maintainer designed for both 6V and 12V battery systems. It features intelligent high-frequency charging technology, automatic mode switching, and versatile connection options, making it an essential tool for maintaining your vehicle's battery health.

## Description

Black & Decker BM3B 6V and 12V Automatic Battery Charger/Maintainer

## Features

- Battery Maintainer For Use In 6V And 12V Battery Systems. Charges Open (Wet) And Sealed (Gel And Agm) 6 And 12V Batteries
- Easy Connection To The Car Battery Using The Included Battery Clamps, Eyelet Terminals Or Dc Connector Of The Vehicle
- Intelligent High Frequency Charging Technology Keeps The Batteries At Optimal Charge
- Automatically Switch Between Charge Mode Monitoring And Float Mode
- Integrated Mounting Bracket

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Item Weight | 1.2 Pounds |
| Item Dimensions D x W x H | 3"D x 5"W x 8.9"H |
| Color | Multi |
| Energy Specifications Met | ETL |
| Current Rating | 1.2 Amps |
| Input Voltage | 12 Volts |
| Output Voltage | 12 Volts (DC) |

## Product Details

- **Brand:** BLACK+DECKER
- **Colour:** Multi
- **Product dimensions:** 7.6D x 12.7W x 22.6H centimeters
- **Item weight:** 544 g
- **Output voltage:** 12 Volts

## Images

![Black & Decker BM3B 6V and 12V Automatic Battery Charger/Maintainer - 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.lk/products/253538339-black-and-decker-bm3b-6v-and-12v-automatic-battery-charger](https://www.desertcart.lk/products/253538339-black-and-decker-bm3b-6v-and-12v-automatic-battery-charger)

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*Product available on Desertcart Sri Lanka*
*Store origin: LK*
*Last updated: 2026-02-15*