With MTB18DYL, you can use the for 18V Li-ion battery or for HongSong JiangMi ZhiPu on 21V Lithium tools. The bottom of the converter applicable for 18V battery model: BL1815, BL1815B, BL1820, BL1820B, BL1830, BL1830B, BL1840, BL1840B, BL1850, BL1850B, BL1860, BL1860B, BL1845, BL1890, BL1890B. And suitable for HongSong / / BoDa / / ZhiPu / JiangMi 18V lithium battery. Note: This product is only adapter. This product does not include machine and battery. The machine and battery in the product description are only used to show the products. Different batches may have different appearances, but not affect the use Colour:Black Material:plastic Package Contents: 5 x 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.