This adapter can make listed lithium batteries use on for 18V LITHIUM cordless power tools , and let you Enjoy the advantages of extended run-time of - 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 power tools. Can not be used for battery charging, this adapter will not fit into any chargers. If you need to charge your batteries , use the original battery chargers. Accessory Type:Battery Accessories Model Number:MT20BSL color:Black Material:ABS Package Contents: 1 x Battery 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.