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BLACK+DECKER Circuit Protection Car Battery Charger

Last updated: July 15, 2022


BLACK+DECKER Circuit Protection Car Battery Charger
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We looked at the top Car Battery Chargers and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Car Battery Charger you should buy.

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp

BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals, Multi, 1.5 Amp
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$22.98

Product Details

In our analysis of 143 expert reviews, the BLACK+DECKER Circuit Protection Car Battery Charger placed 16th when we looked at the top 19 products in the category. For the full ranking, see below.

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.

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Our Expert Consultant

Vicki Liston 
Home Improvement Expert

Vicki Liston writes, produces, and narrates “On The Fly…DIY,” an award-winning home improvement and DIY show of unique project tutorials for the casual DIY’er.

Home improvement and all things DIY have been Liston’s passion since she bought her first house in 2007 and she started making video blogs in 2014. She’s performed hundreds of DIY projects, from small ones to major, wall-smashing renovations and can teach you how to make a trendy DIY barn door for cheap. The proceeds earned from “On The Fly…DIY” are donated to no-kill animal shelters and rescue organizations.

Expert Reviews


What reviewers 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
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
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
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
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
The clips, terminal rings, and DC plug have a quick connect attachments for convenient removal and attachment.
- Curate View

What reviewers 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
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
The quality of build is not sturdy as the other prominent models.
- Curate View

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View our Car Battery Charger buying guide for in-depth advice and recommendations.

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