1.It is used to repair and assemble batteries pack,2.only for people who are familiar with battery performanceand have practical experience in battery assembly.3.Standard chip board PCB for replace for Dewalt tools battery DCB2004.For Dewalt 20V DCB200 DCB201DCB203 DCB204 Li-Ion BatteryNote: This product is Charging Protection Circuit Board without battery core.size:8x3.5x1cmMaterial:PCB+metalcolour:Black+GreenPackage Contents:3 x DCB200 Li-ion Battery PCBOnly the above package content, other products are not included.Note: Light shooting 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.