For Milwaukee Battery Adapter: Compatible with Milwaukee for M18 Battery. (Only adapter included, no battery) For Milwaukee battery converter: convert for M18 battery to be battery replacement for other power tools. Portable: You don't need take different batteries and chargers for various power tools. Only for M18 battery with this battery adapter is enough. Easy to use: insert for M18 battery into this battery adapter, then insert adapter into power tools, your for dewalt battery can work for other power tools. No matter what product problem, please enter the product details page and Click the "YMWLKJ" under the shopping cart, then click "Ask the question" to send message, we'd solve it right away. for Milwaukee to for Ryobi Battery Adapter, convert for Milwaukee for M18 battery to work for Ryobi 18V lithium battery tools