With MTB18DVL, you can use the for 18V Li-ion battery on for 20V lithium electric power tools. Bottom of converter: Compatible with for BL series 18V lithium-ion batteries, suitable for battery models: BL1815 BL1815B BL1820 BL1820B BL1830 BL1830B BL1840 BL1840B BL1850 BL1850B BL1860 BL1860B BL1845 BL1890 BL1890B......, 18V lithium battery. Top of converter: Compatible with for Compatible with 20V lithium battery tools; [for power tools must be compatible with 5150-Li-20-52, 5150-Li-20-40, 5150-Li-20-26, 20V lithium battery models]. Note:(a). This product is only adapter. No includes the battery and machine in the picture. (b).This product does not include machine and battery. The machine and battery in the product description are only used to show the products (c). MTB18DVL is only suitable for the " BL18xx " series lithium batteries, not suitable for the " BL18xxG " series lithium batteries. Color: Black Material: ABS Package Contents: 1 x MTB18DVL Adapter Converter 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.