Features: Enhances your DIY projects with our Power Adapter, compatibility for 18V/21V BL1830 BL1840 BL1850 Battery. This battery adapter provides stable and reliable power output, making it for high intensity tasks without interruptions. Perfect for DIY enthusiasts and hobbyists who frequently work with remote car, robotics, and other cordlessly power tool, offering them a versatility power solution. Crafted from durability ABS and metal materials, this adapter not only promises longevity but also enhances the efficiency of your tools, reducing the need for frequent battery replacements. The product have multiple protections such as overheats protections, short circuits protections, overvoltage protections and overcurrent protections, which greatly improves safety of the product and you can use it safely. Specifications: Component:ABS+Metal Size:Approx.39.3x25mm/1.55x0.98inch Cable Length:Approx.8cm/3.15inch for 18V/21V BL1830 BL1840 BL1850 Battery; Package Includes: 1pc Battery Adapter note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual item color.