The battery adapter is compatible with 14.4V/18V lithium-ion batteries, convert your battery to DIY cable connection output. The adapter does not support charging M18 series lithium-ion batteries.Small Size and Light Weight: The compact design of the wheels battery adapter is easy to carry and install, and can lock the battery well.Provide for your skateboards, toy and more, you can also use it to connect to lights.Premium Materials: Adaptor connector is made of ABS material, durable and high temperature , minimize the loss during the conversion process.Easy to Switch: Work with 14.4V/18V lithium-ion battery,moving the position of the conductive sheet to the letter "M" or "B", and then fix the screw in the screw hole of the corresponding letter.Specifications:Only work with 18V Li-ion Battery.Fit for battery model: BL1830 BL1840 BL1850 BL1860 BL1840B BL1850B BL1860B BL1440 BL1430 BL1820The red wire is connected to the positive battery terminal, and the black wire is connected to the negative battery terminal.Item weight: 100gColour:blackMaterial:ABS Size:9 x 6.3 x 2.5cmPackage Contents:2 * Battery AdapterOnly the above package content, other products are not included.Note: Light 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.