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


Shipping Cost: Free!

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

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.


  • Spark-resistant hook-up, reverse connection warning and overcharge protection
  • Three easy connections: battery clips, ring terminals & vehicle dc plug
  • Two-stage, high-frequency charging technology for maximum efficiency and performance
  • Automatically switches between charging mode and float mode monitoring to prevent overcharging
  • AC Low voltage compensation ensures maximum performance when used with an extension cord

Shipping Cost: Free!

Return Policy: Within 30 in the original packaging

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Review Snapshot

  • 4.5 of 5 stars
69% (24)
18% (6)
6% (2)
0% (0)
9% (3)
  • This thing is GREAT! Using it on Honda Accord.   »   Most Recent Review “I own a rarely-used Honda Accord that I always have to jump start. I bought this Black & Decker BM3B Battery Charger/Maintainer to solve the dead battery issue and am delighted!”
  • Battery insurance   »   Most Helpful Reviews “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.”
  • Color coding maybe wrong on one (or more) of harness! Verify the wires, not the color!   »   Most Helpful Critical Reviews “i bought this item to charge my motorcycle. Looked really good and clips are even better with plastic insulation around it, not as shown in product picture. But guess what!?”