Converts for 40V lithium batteries to for 20V max lithium battery, allowing compatibility with various cordless power tools. Superior compatibility with multiple 40V battery models, enabling use with for 20V cordless drills, impact drivers, and outdoor tools. Built-in voltage protection chip ensures safe operation, while the high-quality ABS plastic construction provides durability. Easy to install and remove, designed specifically for 20V tools, ensuring a secure fit and reliable performance. Note that this is an adapter, not a battery; it cannot be used for charging power tool batteries and should be removed before charging. The RYB40DW20 battery adapter is designed to enhance the versatility of your power tools by allowing the use of for 40V lithium batteries with for 20V cordless tools. This adapter is perfect for those who want to maximize their battery usage and enjoy longer working times, whether indoors or outdoors. With its robust construction and safety features, you can trust this adapter to perform reliably in various applications. Color: Black Material: ABS Package Contents: 1* Battery Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.