Milwaukee 18V to Black and Decker 20V Battery Adapter

Update, 7/8/2026 to 3 stars: Support was quick to reply and open an investigation as to my problem adapter. Hopefully this is just a “one off” thing and they can double check remaining inventory for the issue. I would advise anyone receiving the adapter to double check polarity before using it. This can be easily done with a multimeter if you have one handy. Original review post: As soon as I connected the M18 battery onto the adapter with my B&D drill, there was a pop and instant burning electrical smell. I immediately removed the battery and proceeded to investigate. I quickly found the issue. The adapter was manufactured with incorrect polarity. It was properly marked/labeled with the correct embossing in the plastic, but the internal wires were taking the + from the M18 battery to the negative terminal of the B&D output, and vice versa. Needless to say, my drill was fried.

This was a battery saver. I was able to puchase this and use my M18 batteries on my Black & Decker yard tools. The build is solid, no loose connectors, and thick plastic. Overall for the its purpose prevented me from buying another battery platform. Plus, the color matches my Milwaukee and Black & Decker. I may purchase more for other tools and keep my current battery. I have recommended this item to my family and friends. I would recommend them putting their logo their product, either embossed or a sticker. It is a product that met my expectations. And, yes it is higher than the ones on other sites, but it fits tighter and more securely than others.