This adapter can make listed lithium batteries use on 18V LITHIUM cordless tools , and let you Enjoy the benefits of extended run-time of Li-Ion Batteries on your existing 18V tools.Maximum initial battery voltage(measured without a workload) is 20volts,Nominal voltage is 18voltsNotice:Allows for use of 18V LITHIUM batteries and replacement batteries in most batteries of :BL1860B/BL1860/BL1850B/BL1850/BL1840/BL1830B/BL1830/BL1820/BL1815,etc.Use for 18V LITHIUM cordless tools.Can not be used for tool battery charging, this adapter will not fit into any chargers. If youneed to charge your tool batteries ,please use the original battery chargers.Colour:blackMaterial:plasticSize:11*10.5*9cmPackage Contents:1x MT20BSL (Only Adapter, No Battery)Only 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.