For M18 to for M12 Battery Adapter: convert for M18 battery to work for M12 tools. This is only a battery adapter to convert for M18 to work for M12 tools, only adapter included in package, no battery. Portable: this battery adapter is much lighter and smaller than battery, you can take it for business trip easily. Easy to use, just insert this converter into battery, then insert it into power tools. your battery can work for 12V power tools. No matter what product problem, please enter the product details page and Click the "DGXYX" under the shopping cart, then click "Ask the question" to send message, we'd solve it right away. for M18 to for M12 Battery Adapter