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BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals

4.5 4.5 out of 5 stars 12,819 ratings

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Charger

Purchase options and add-ons

Brand BLACK+DECKER
Color Multi
Product Dimensions 3"D x 5"W x 8.9"H
Item Weight 1.25 Pounds
Input Voltage 12 Volts

About this item

  • Battery Maintainer for use on 6V & 12V battery systems Charges 6 and 12 volt AGM, GEL and WET batteries
  • Easy connection to vehicle battery using the included battery clips or O-ring terminals
  • High-frequency smart charging technology keeps batteries at optimal charge
  • Automatically switches between charging mode and float mode monitoring
  • Built-in mounting bracket
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$27.59
Get it as soon as Monday, Mar 18
In Stock
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Important information

Legal Disclaimer

WARNING - Cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.

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Top Brand: BLACK+DECKER

Highly Rated
4.4/5 star rating from 100K+ customer ratings
Trending
100K+ orders for this brand in past 3 months
Low Returns
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BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals
BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals
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Price-8% $27.59
Typical:$29.99
$49.99$20.30$26.95$34.99$17.95
Delivery
Get it as soon as Monday, Mar 18
Get it as soon as Monday, Mar 18
Get it as soon as Monday, Mar 18
Get it as soon as Monday, Mar 18
Get it as soon as Monday, Mar 18
Get it as soon as Monday, Mar 18
Customer Ratings
Value for money
3.8
4.2
4.0
4.3
4.5
5.0
Easy to use
4.5
4.5
4.4
4.7
5.0
Safety Features
3.8
4.1
3.9
Versatility
3.9
4.9
4.5
Sold By
Amazon.com
GOOLOO
Amazon.com
NEXPOWER
oanarll
HUIAIPAIC US
input voltage
12 volts
12 volts
12 volts
110 volts of alternating current
12 volts
110 volts of alternating current
weight
1.25 pounds
1.32 pounds
1.25 pounds
0.26 kilograms
0.65 kilograms
280 grams

From the manufacturer

Black and Decker 6 and 12 volt battery maintainer and charger

1.5 Amp

6V and 12V

2 ways to connect

Voltage

Charges/maintains batteries and keeps batteries at optimal charging capacity

Automatically charges and maintains battery charge level of your 6 volt or 12 volt AGM, GEL and WET batteries

Includes both battery clamps and terminal rings for direct battery connection

AC Low voltage compensation ensures maximum performance when used with an extension cord

Charging

Polarity

Quick Connector

dimensions

Gives a quick and easy view of battery charger/maintainer operation

Provides reverse polarity protection to assure that jumper cables are connected correctly

Easily and safely swap connections between battery clamps and ring terminals

Dimensions 2.8 x 5.5 x 1.6 inches

Product information

Warranty & Support

Installation Guide View [PDF ] Product Warranty: For warranty information about this product, please click here [PDF ]

Feedback

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals


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Product guides and documents

What's in the box

  • charger
  • Product Description

    The Black & Decker BM3B battery charger/maintainer features 6 volt and 12 volt charging selectivity. Use for battery maintenance, charging RVs, specialty vehicles, antique and classic cars, marine deep cycle batteries, motorcycles, lawn mowers, ATVs, snowmobiles, personal watercraft and more. Maintains battery charge in stored vehicles and battery applications. Includes three connector sets: DC accessory plug, battery clips, and battery ring terminals. Fully automatic, provides a charge when needed, stops charging when battery is fully-charged or topped-off. Built-in circuit protection guards against overcharging, reverse polarity or short circuit.

    Customer reviews

    4.5 out of 5 stars
    4.5 out of 5
    12,819 global ratings

    Customers say

    Customers are impressed with the quality, ease of installation, and delivery of the battery charger. They mention that it works great to charge your vehicle battery, and maintain its charge even long term. They are also satisfied with accessories, and size. That said, opinions are mixed on performance, and charging.

    AI-generated from the text of customer reviews

    2,389 customers mention1,838 positive551 negative

    Customers like the quality of the hardware. They mention that it works well, is portable, and impressed with the results. Some say that the amps are a little bit higher for a faster charge, but overall, they are satisfied with the product. They also mention that the clamp hook up was of good quality, and that it can switch to 6V.

    "***2024 UPDATE***I've owned this since 2018, works like new!..." Read more

    "...This charger does work like a boss! I live in Wisconsin where winter lasts for what feels like a lifetime...." Read more

    "...They work well and the price is very good for what they are...." Read more

    "...and works great when things are near perfect, it simply refuses to function on some of my vehicles...." Read more

    705 customers mention622 positive83 negative

    Customers like the value of the hardware. They mention that it does the job at a very reasonable price.

    "...They work well and the price is very good for what they are...." Read more

    "...They do the job at a very reasonable price." Read more

    "Works great and was a very nice price" Read more

    "I like the unit, good price, however I have had to order new ring terminal connectors from another vendor as those that come with the unit are short..." Read more

    537 customers mention517 positive20 negative

    Customers find the installation process of the battery charger to be easy. They mention that it is quite simple to use, with two settings, one for motorcycle and one for car. Customers also appreciate the convenience of the device, saying that it can be easily disconnected.

    "...I plug it in when car is in the garage. So easy! And the battery gets a "good" rating from the mechanic when I take the car in for maintenance." Read more

    "This should be the first maintainer you buy. Simple to use, and not as "fickle" as some charger/maintainers...." Read more

    "Worked great and easy to use" Read more

    "Easy to use. Good at charging" Read more

    267 customers mention253 positive14 negative

    Customers like the size of the charger. They say it's easy to use and store, and is very good for on-the-go travel. The alligator clips are compact and easy to attach to the car battery. The charger is small and easy fits back into its original packaging.

    "...I was impressed and found these to be very nice, compact alligator clips. Perhaps not the most durable, but they are really pretty decent." Read more

    "Perfect for keeping battery maintained with nice cord length. Working great so far." Read more

    "...BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer is small and light (not heavy and bulky like my old transformer-based charger)..." Read more

    "...Up until today, I really liked this charger. The cords are long, and it worked perfectly. I am going to give it another shot in the cold...." Read more

    135 customers mention111 positive24 negative

    Customers like the accessories of the battery charger. They mention that it comes with any attachment you might need, alligator clips and eyelets that are interchangeable by a 2 prong plug, and lots of accessories. They like that it includes three different hookup adapters, a battery terminal connector, and clamps for attaching the leads to the battery terminals. The quality is solid and it comes a few extra leads that they didn't need.

    "...The kit includes large spring-clips to connect to any battery temporarily, and also has connectors that can be hard-connected to the battery..." Read more

    "...clamps to attach it to the battery posts but it also come with a couple other attachments to either connect it to the cigarette lighter or to screw..." Read more

    "...It comes with all the attachments you would need, including directly battery connections and alligator clamps, and they all have a quick disconnect..." Read more

    "...It comes with clamps for attaching the leads to the battery terminals, and also has a pair of leads with ring terminals for fastening to a battery..." Read more

    129 customers mention123 positive6 negative

    Customers are satisfied with the delivery of the battery charger. They mention that it is a very fast charger, it charges their battery completely within a few hours, and it starts quickly. The charger is well packaged and rugged, simple, reliable, and works perfectly.

    "Fast shipping" Read more

    "Shipped fast and works perfect" Read more

    "...It charges the 12-volt batteries reasonably fast, and monitors them to keep them charged...." Read more

    "...I use several kinds of maintenance/charger but this unit is well packaged, rugged, simple, reliable and functions with out fail...." Read more

    1,224 customers mention841 positive383 negative

    Customers are mixed about the charging of the battery charger. Some mention that it's been keeping the Harley battery nicely charged, while others say that it didn't take a charge and it kept losing its charge.

    "...They are always charged up and ready to go...." Read more

    "...hibernation during those frigid months, but this charger keeps its battery charged and ready to rumble come springtime...." Read more

    "...NOTE: Full charging takes days. Use thus on older batteries, to bring them back to life...." Read more

    "This battery maintainer is all you need. No fancy buttons to adjust , just plug it into and set it to 6 or 12 volts and your done...." Read more

    517 customers mention225 positive292 negative

    Customers are mixed about the performance of the battery charger. Some mention that it's pretty reliable and hasn't had any issues, while others say that it failed after three weeks of use, it' s too unreliable, and has only a trickle charge.

    "...Perhaps not the most durable, but they are really pretty decent." Read more

    "...This unit has held up very well over the last six years and does what it should do...." Read more

    "...while it charged it up a bit, but the charge didn't take and it doesn't restart. The battery read 7.5 Volts and dropping...." Read more

    "...steady at about 13.0V. I believe these maintainers are perfect for small battery applications...." Read more

    Fail too soon but has good warranty
    5 Stars
    Fail too soon but has good warranty
    Stopped working soon after the Amazon return period expired. I contacted warranty support and they sent a replacement.
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    Top reviews from the United States

    Reviewed in the United States on March 9, 2024
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    Reviewed in the United States on January 30, 2023
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    Reviewed in the United States on March 9, 2024
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    Top reviews from other countries

    Translate all reviews to English
    Luiz
    4.0 out of 5 stars Muito boa
    Reviewed in Brazil on October 8, 2022
    Style: ChargerVerified Purchase
    W.A.C
    5.0 out of 5 stars Works well
    Reviewed in the United Kingdom on February 15, 2024
    Style: ChargerVerified Purchase
    PacketLoss
    5.0 out of 5 stars So far so good. I received this in very short order and ...
    Reviewed in Canada on November 19, 2017
    Style: ChargerVerified Purchase
    4 people found this helpful
    Report
    Vivcals
    5.0 out of 5 stars Five Stars
    Reviewed in India on April 27, 2017
    Style: ChargerVerified Purchase
    3 people found this helpful
    Report
    Miss G.
    1.0 out of 5 stars Does not state it’s a US PLUG!!!!!!!
    Reviewed in the United Kingdom on December 4, 2023
    Style: ChargerVerified Purchase