1.It is used to repair and assemble batteries pack,2.only for people who are familiar with battery performance and have practical experience in battery assembly.3.Standard chip board PCB for replace for tools battery4.Replacement 18V Lithium-Ion Battery PCB Circuit Board For R840083 R840085 R840086 R840087 and moreNote: This product is Charging Protection Circuit Board without battery core.colour:greenmaterial:PCBsize:11x6x2cmPackage Contents:1 x battery protection boardOnly 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.