This adapter can make the listed lithium batteries used in 20V lithium cordless batteries and allow you to enjoy the benefits of extended runtime ion batteries in your existing 18V tools. The maximum initial battery voltage (measured without load) is 20 volts, the nominal voltage is 18 voltsAllows the use of 18V lithium batteries and replacement rechargeable batteries in most batteries for: BL1860B/BL1860/BL1850B/BL1850/BL1840/BL1830B/BL1830/BL1820/BL1815, etc. Use for 20V MAX cordless lithium power tools. Color: Black Material: Plastic Package Content: 1 * Adapter Only the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm