This adapter can make listed lithium batteries use on for 18V LITHIUM cordless tools , and let you Enjoy the advantages 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 18volts.Allows for use of 18V LITHIUM batteries and replacement batteries in most batteries of for : 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 you need to charge your tool batteries ,please use the original battery chargers.Accessory Type:Battery AccessoriesModel Number:MT20BSLcolor:BlackMaterial:ABSPackage Contents:2 x Battery AdapterOnly 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.