Review on Mellif USB Battery Adapter DM18RL: Convert Dewalt 20V & Milwaukee 18V to Ryobi 18V Lithium-ion Battery by Tony Miller

I hesitated to buy because these things never work properly. I have a Ryobi One+ Sander because it's cheap and wireless. I also have a million Milwaukee and Dewalt 18-20v batteries for all the other cordless tools I own. I didn't want to buy another battery as I had so many other brands so I bought this adapter. At first I wasn't sure if it would work because it didn't quite fit the Ryobi (P102) battery as the original has a 3rd pad that the adapter doesn't have (probably for the charger). I plugged in the adapter and plugged in a Milwaukee 18v battery, hit the power button and it lit up immediately. Then I tried a Dewalt 20V battery, pressed the power button and the grinder ran like clockwork. The Ryobi grinder battery is pretty anemic and only lasts a maximum of 10 minutes. This adapter just increased my run time to several hours while keeping my Dewalt and Milwaukee batteries charged. Good product.