Fangrui Product Details [well Compatible]fits Well For 18v Cordless Tools, Which Means You Can Use Your Old For 18v Batteries To For 18v Power Tools. [work For / 18v Li-ion Battery]: Our Ar18mil Battery Adapter Only Fit For / 18v Lithium Battery, To For 18v Li-ion Battery.(battery Not Included). [ar18ml Advantage]this Adapter Can Make Listed Lithium Batteries Use For 18v Tools , And Let You Enjoy The Benefits Of Extended Run-time Of Li-ion Batteries On Your Existing 18v Tools. [material ]made Of High Quality Abs Plastic, Solid Design, Made Of High Quality Material, And Safe, Convenient To Carry And Easy To Use. [easy To Use]: The Ar18mil Battery Adapter Is Really Easy To Use. Just Insert The 18v Battery Into Our Ar18mil Adapter; And Then Pull Both Into The Base Of 18v For Power Tools, Then You Can Use The For 18v Power Tools As Normal. [notice]it Cannot Be Used To Charge The Battery Of A Power Tool, And The Adapter Cannot Be Plugged Into Any Charger. If You Need To Charge The Power , Use The Original Battery Charger. C