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BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
Return this item for free
Free returns are available for the shipping address you chose. You can return the item for any reason in new and unused condition: no shipping charges
Learn more about free returns.- Go to your orders and start the return
- Select the return method
- Ship it!
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
Frequently bought together
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Important information
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WARNING - Cancer and reproductive harm. For more information go to www.P65Warnings.ca.gov.
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Top Brand: BLACK+DECKER
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This Item BLACK+DECKER BM3B Fully Automatic 6V/12V Battery Charger/Maintainer with Cable Clamps and O-Ring Terminals | Recommendations | dummy | dummy | dummy | dummy | |
Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | Try again! Added to Cart | |
Price | -8% $27.59$27.59 Typical: $29.99 | $49.99$49.99 | $20.30$20.30 | $26.95$26.95 | $34.99$34.99 | $17.95$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
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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 |
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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
Product Dimensions | 5 x 3 x 8.9 inches |
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Item Weight | 1.25 pounds |
ASIN | B0051D3MP6 |
Item model number | BM3B |
Customer Reviews |
4.5 out of 5 stars |
Best Sellers Rank | #4,778 in Automotive (See Top 100 in Automotive) #52 in Battery Chargers |
Is Discontinued By Manufacturer | No |
Date First Available | March 30, 2011 |
Manufacturer | Black & Decker |
Country of Origin | China |
Warranty & Support
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Black + Decker BDV090 | Unboxing, overview and usage
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Black & Decker Battery Charger works great - Why I use it!
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KEEP THAT BATTERY CHARGED!!! B & D trickle charger.
Bob Murtha
Product guides and documents
What's in the box
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
Customer Reviews, including Product Star Ratings help customers to learn more about the product and decide whether it is the right product for them.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.
Learn more how customers reviews work on AmazonCustomers 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
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
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
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
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
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
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
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
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
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Top reviews from the United States
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I've owned this since 2018, works like new!
Low and slow is the best way to charge and bring a battery back to life and/or top off a well performing battery. I use this on three cars of mine and help a neighbor here and there. This unit has held up very well over the last six years and does what it should do.
Problem: If your battery is really low in voltage it will not charge,
Solution = Jump the car off a pack or another vehicle let it run for 10 mins and you will then be able to use this to charge that battery. NOTE: Full charging takes days. Use thus on older batteries, to bring them back to life. I recommend using a different 10 AMP charger if you want to charge a battery faster, 10 AMPS works for AMG batteries too.
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2018 (this is what I noticed)
Workers great 1.5 AMPS is the perfect amount to slowly change a battery over ×multiple days×. Remember alternators do not charge dead or low voltage battery's, you need to charge your cars battery.
This charger does work like a boss! I live in Wisconsin where winter lasts for what feels like a lifetime. My poor lawn mower goes into hibernation during those frigid months, but this charger keeps its battery charged and ready to rumble come springtime. No more buying a new battery every year, thank goodness!
This unit is almost laughably lightweight, but other than one battery clip that broke, it has worked great. Light on the unit flashes green when actively charging, then turns solid green after shifting to monitoring mode. (If yellow, you have a problem. Try unplugging from power, and then jiggling/reconnecting the battery clips. Red to positive, black to negative) I also have a Schumacher maintainer, and although it seems to be built a little more substantially, and works great when things are near perfect, it simply refuses to function on some of my vehicles. So, I put this charger on those and use the Schumacher where it will work. I have multiple vehicles, including a couple of riding mowers, so I go out periodically during the winter and move the maintainers to different vehicles.
Top reviews from other countries
Update: This product worked great for me, left it plugged in all winter and just fired up my car this afternoon without any problems. It let me know when there was a problem with a little red light, that happened a couple times when the clips on the battery were bumped. Another great product by Black & Decker!!!