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

• Battery Maintainer for use on 6V & 12V battery systems
• Easy connection to vehicle battery using the included battery clips, O-ring terminals or vehicle DC plug
• High-frequency smart charging technology keeps batteries at opitmal charge
• Automatically switches between charging mode and float mode monitoring
• Built-in mounting bracket

I bought this from Home Depot for about $20.00 and use it to maintain my motorcycle battery. Compact, LED indicators and all the connectors you would need. I plug mine directly into the cigarette lighter socket on my bike which is connected straight to the battery. Worth every penny!!

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This was the least expensive battery maintainer I was able to find. It comes with a variety of connection options, just like the more expensive maintainers do. It is switchable between 6V and 12V. Most battery maintainers either only support 12V or require a different model to maintain a 6V battery.

On the negative side, the 6V/12V selector feels cheap and each time you switch it, you wonder if it's going to break. It might actually be solid, but it sure doesn't feel that way.

Also, unlike other chargers like the Battery Tender Jr., this one will severely overheat very small batteries. I can't find any specifications for the minimum battery size, but I would assume that anything that can't safely be charged at 1.2A should not be connected to this device.

Lastly, it doesn't seem to support AGM batteries. Newer motorcycle and PWC batteries are of this type. So this is the most serious limitation. The current Battery Tender Junior model does.

If you need a charger that can support both 6V and 12V or know you will never need to maintain an AGM or very small battery, this is a very low cost charger that works perfectly for those applications. It's perfect for traditional sealed lead acid or wet cell batteries used in many PWCs, motorcycles, cars, golf carts, electric toy cars.

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I bought this from Amazon to use on my BMW sports car to maintain the car battery during winter storage. The charger is compact, has LED indicators and all the connectors you would need. Mine is plugged directly into the battery post cables using one of the many supplied connectors which is connected straight to the battery. That leaves both the clips and cigarette lighter ones available for other uses. Worth every penny!!

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I bought this for my girlfriends motorcycle and it works very well. I have used other maintainers / chargers before this one and can tell you this is a great little "tool" that anyone can use!!!

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I had no idea a maintainer could be this cheap, but I took the chance. Now that I have it (been using the cigarette lighter option), I can't imagine why you would pay more. It is so sensitive that with it fully charged, if you open the door it will sense the load and start working again to freshen up the battery. Great item!