1 is used to repair and build batteries pack, 2. people who are acquainted with battery functionality and feature real looking journey in battery assembly. three chip board PCB for replace for Black devices battery four LBXR20 20V Lithium-Ion Battery PCB Circuit Board For Black colour: inexperienced Material: PCB size: 3 Package Contents: 1 * Protection Board Note: This product is Charging Protection Circuit Board without battery core. Only the above kit content, other item usually are not included. Note: Light and various reveals could cause the colour of the article in the picture a bit various from the real thing. The dimension allowed error is +/- 1-3cm.