Converts for 40V lithium batteries to for 18V cordless power tools, allowing for extended use of high-capacity batteries. Superior compatibility with for 40V lithium batteries (BL4040, BL4025, BL4045, BL4045F) and for 18V tools including drills, impact drivers, and outdoor equipment. Built-in voltage protection chip ensures safety and reliability during operation, made from high-quality ABS plastic for durability. Easy to install and remove, designed specifically for for 18V tools, providing a secure fit and excellent performance. Note that this is an adapter, not a battery; it cannot be used for charging and should be removed before charging the battery. This battery adapter is designed to enhance the versatility of your power tools by allowing the use of for 40V lithium batteries with for 18V cordless tools. It is perfect for those who want to maximize their battery usage for both indoor and outdoor tasks. The adapter is user-friendly, ensuring a hassle-free installation process, and its robust construction guarantees long-lasting performance. 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.