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 Black Deckers tools battery 4.Replacement LBXR20 20V Lithium-Ion Battery PCB Circuit Board For Black Deckers colour: green Material: PCB size: 3.5x3x1cm Package Contents: 1 * Protection Board Note: This product is Charging Protection Circuit Board without battery core. Only 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.