This adapter can make lithium batteries compatible with Ryobi 18V tools and allow you to enjoy the benefits of extended runtime of Li-lon batteries on your existing 18V tools. Features: 1. Allows the use of 18V lithium batteries and replacement batteries in most batteries compatible with Dewalt and 18V lithium batteries and replacement batteries in most batteries compatible with Milwaukee M18. 2. The battery adapter can make lithium batteries compatible with Ryobi 18V tools that use lithium battery or nickel battery. 3. The maximum initial voltage of the battery (measured without workload) is 20V, the nominal voltage is 18V. 4. The USB port for charging phones and powering equipment that uses USB, and the USB line is not included. 5. Compact and portable, easy to install and disassemble, upgrade your old tools. Note: 1. Due to manual measurement, the size may be slightly different. Thanks for your understanding. 2. Due to different lighting conditions and different monitors, the item