Product This adapter enables the listed lithium battery to be used for Ryobi 18V tools and allows you to enjoy the benefits of extending the operating time of lithium-ion batteries on existing 18V tools. The maximum initial battery voltage (measured without operating load) is 20 volts and the nominal voltage is 18 volts.1. Through USB, when the mobile phone is temporarily powered off, you can charge the power bank function.2. This adapter enables the listed lithium battery to be used for Ryobi 18V tools, and allows you to enjoy the benefits of extending the operating time of lithium-ion battery on existing 18V tools.3. The maximum initial battery voltage (measured without load) is 20 volts and the nominal voltage is 18 volts.be careful:Maximum 20V batteries and replacement batteries are allowed in most batteries of DeWalt, and 18V lithium-ion batteries and replacement batteries are allowed in most batteries of Milwaukee.Used for Ryobi 18V electric tools.USB port is used to charge mobile phones and power devices using USB, excluding USB cable. This adapter is not suitable for any charger. If you need to charge the power tool battery, please use the original battery charger.Package contents:1 adapter (adapter only, no battery)