This RYB20DW battery adapter converts for 18V Lithium battery to 20V lithium battery, perfect replacement for 20V lithium battery, which means you can use your a lot of for 18V batteries to for for 20V Cordless Tools, save your money on new serie 20V battery.Converter top port compatible with 20V cordless power tools. Converter bottom port compatible with for P102, P103, P104, P105, P107, P108, P109 18Volt battery, Convert them to for 20V max Lithium DCB208 DCB207 DCB201 , etc Battery.Converter top: Compatible with for series 18V/20V MAX lithium battery power tools; [for power tools must be compatible with DCB180, DCB181, N123282, N123283 DCB202 DCB206, 18V/20V(MAX) lithium ion battery models]Extend working life for 20V power tools, and make most use of for 18V ONE+ Battery.Notice: It cannot be used to charge for battery, please remove the adapter from your battery after use, then use charger to chrge your battery.Material Guarante: Made of high quality ABS, solid design, made of high quality material, durable and safe, convenient to carry and easy to use.Material: ABScolour: green+blackPackage Contents: 1 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.