BLACK+DECKER Battery Charger and Maintainer

Last updated date: November 23, 2019

DWYM Score
8.6

Why Trust The DWYM Score?

DWYM is your trusted product review source. Along with our in-house experts, our team analyzes thousands of product reviews from the most trusted websites. We then create one easy-to-understand score. Learn more.

Look for the DWYM seal for products that are the best in the category.

We looked at the top 1 Car Battery Chargers and dug through the reviews from 18 of the most popular review sites including Best Selected Products, Battery Focus, Top Portal Review, Pro Car Reviews, Best of Machinery, Easy Get Product, Disneysmmoms, Battery Chargers Expert, A Guide Product, Drivr Zone, Mechanic Base, Auto Quarterly, Ama Top 10, Car Battery Help, Car Diagnosing, OBD Advisor, Curate View and more. Through this analysis, we've determined the best Car Battery Charger you should buy.

Overall Take

In our analysis of 158 expert reviews, the BLACK+DECKER BLACK+DECKER Battery Charger and Maintainer placed 8th when we looked at the top 10 products in the category. For the full ranking, see below.

Editor's Note November 19, 2019:
Checkout The Best Car Battery Charger for a detailed review of all the top car battery chargers.

Expert Summarized Score
9.0
18 expert reviews
User Summarized Score
7.8
3,932 user reviews
Our Favorite Video Reviews
What experts liked
It stays relatively cool throughout
- Best Selected Products
Versatile across engine types and connection preferences
- Battery Focus
It features a high frequency smart charging technology to keep the battery at an optimal charge.
- Top Portal Review
August 11, 2019 | Full review
The smart charging technology of the BM3B model ensure the battery remains at optimal charge. It will automatically switch between full charging and float mode, which is fairly impressive for a cheap unit.
- Pro Car Reviews
Built-in circuit protection protects your battery from overcharging, reverse polarity or short circuit.
- Best of Machinery
October 2, 2019 | Full review
Featuring a built-in circuit protection system, it guarantees the safety of the battery from reverse polarity, short circuit or overcharging.
- Easy Get Product
The battery clip helps to connect your battery for charging or maintaining, O-ring helps you charge your battery for an extended period, and DC plug charges your battery from the inside of your vehicle without touching.
- Disneysmmoms
September 9, 2019 | Full review
It has a durable and sturdy build and with its protection seal you can easily use it under all kinds of weather and temperature conditions
- Battery Chargers Expert
Keep the battery always at the optimum charge with smart technology
- A Guide Product
The body of the charger has special mounting holes, so securing the device in the needed position is a piece of cake
- Best Advisor
This Black and Decker battery charger features high frequency smart technology that ensures that your battery is kept at the optimal charge, even you don't know what that is. It also automatically switches charging modes to ensure that there is no over charging
- Drivr Zone
The charger is cheap, and the charger is tiny, so you can store it in your glove box or your garage. The charger is using a smart charging monitoring to charge your car battery the best way.
- Mechanic Base
June 7, 2019 | Full review
Protects from overcharging, short-circuiting, and reverse polarity
- Auto Quarterly
Its automated system also checks the battery’s capacity and stop charging when it is topped off or fully charged. Once the charging stops, it automatically switches to float mode monitoring to prevent overcharging, which often damages car and marine batteries.
- Ama Top 10
The Black & Decker BM3B can be alternated between 12V and 6V as per you batteries requirements, making it suitable for both small and large vehicles having either 12V or 6V.
- Car Battery Help
It comes with a smart charging technology that enables you to charge the battery without the fear of overcharge. The charger intelligently knows about the optimal charge, and it keeps the battery at that optimal charge during charging.
- Car Diagnosing
Reverse Polarity: It makes sure you face no loss if you end up connecting the battery in the wrong manner thanks to reverse polarity protection. So that, the unit will not work until you correct the connection, protecting you and the battery.
- OBD Advisor
September 7, 2019 | Full review
The clips, terminal rings, and DC plug have a quick connect attachments for convenient removal and attachment.
- Curate View
October 10, 2019 | Full review
What experts didn't like
The only downside of this model that we could see is that it does take a while to charge. If the battery is completely drained, you may need to charge it for ten hours or more.
- Battery Focus
The charger does not support AGM batteries and PWC batteries which is one of the limitations and shall be improved
- Battery Chargers Expert
It is quite expensive compared to other models
- A Guide Product
The clips do not always provide a tight grip on battery posts
- Best Advisor
Might be bulkier than others
- Drivr Zone
The charger has the capacity of 1.5 Ampere, which is not a lot but might be enough if you want to maintain charge of your car battery.
- Mechanic Base
June 7, 2019 | Full review
Poor quality LED lights
- Auto Quarterly
a few customers have reported that it can at times overcharge the battery.
- Car Battery Help
Connecting wires could be small
- Car Diagnosing
The cigarette lighter feature may not work for all cars.
- OBD Advisor
September 7, 2019 | Full review
The quality of build is not sturdy as the other prominent models.
- Curate View
October 10, 2019 | Full review

From The Manufacturer

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.

Overall Product Rankings

1. Clore Automotive Jump Starter
Overall Score: 10.2
Expert Reviews: 16
2. GOOLOO Portable Battery Charger and Jump Starter
Overall Score: 9.7
Expert Reviews: 10
3. DBPOWER Portable Battery Charger and Jump Starter
Overall Score: 9.5
Expert Reviews: 17
4. NOCO Portable Car Battery Jump Starter Pack
Overall Score: 9.2
Expert Reviews: 15
5. Battery Tender Car Battery Charger
Overall Score: 9.2
Expert Reviews: 15
6. GOOLOO Quick Car Jump Starter and Charger
Overall Score: 9.1
Expert Reviews: 4
7. NOCO Car Battery Charger and Maintainer
Overall Score: 9.1
Expert Reviews: 15
8. BLACK+DECKER Battery Charger and Maintainer
Overall Score: 8.6
Expert Reviews: 18
9. STANLEY Car Power Station Jump Starter
Overall Score: 8.3
Expert Reviews: 14
10. MOTOPOWER Car Battery Charger and Maintainer
Overall Score: 8.0
Expert Reviews: 16

An Overview On Car Battery Chargers

DYWM Fun Fact

The Car Battery Charger Buying Guide