Through the converter,20V for lithium battery can be converted into 18V nickel,can be used instead of nickel,for 18V tools and allows for use of 20V MAX compact batteries. The DCA1820 adapter do not work with for 12V and 20V/60V FLEXVOLT Batteries. This adapter no need to be .(Please remove on adapter before charging battery) Advanced technology,using advanced spot welding machine,automatic internal resistance meter,automatic battery sorting. For DCA1820 adapter work with: MAX XR DCB201 DCB203BT DCB206 Compact Batteries Replaceable battery: 18 volt DC9096 DE9039 DE9095 DE9096 DE9098 DW9095 DW9096 DW9098 DE9503 battery USB interface output: DC 5V/2.1A Type: Battery Convertor Adapter Rated Current: 2.5A Ambient Temperature: 25 degrees Compatible for 18V/20V lithium batteries Color: Material: plastic Package Contents: 1 x Battery Convertor 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.