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.Replacement BAT610 18V Lithium-Ion Battery PCB Circuit Board For Boschs BAT609 BAT609G BAT618 BAT618G Li-ion Battery Replace Part Number BAT609 BAT609G BAT618 BAT618G Colour:green Material:PCB Package Contents: 10 * Li-ion Protection Board Only 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.