1.It is used to repair and 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 battery 4.For 20V DCB201DCB203 - Battery Note: This product is Charging Protection Circuit Board without battery core. Color: black + green Material: PCB+Metal Package Contents: 2 x Protection Board Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.