1.It is used to repair and assemble battery pack, 2.Only for people who are familiar with battery performance and have practical experience in battery assembly. 3.Standard chip board for replacing DCB120 tool battery 4.For 12V 10.8V DCB120 Li-Ion battery Note: Product is a charging protection circuit board without battery core. Size: 3.9 x 2.9 x 1.4cm Material: PCB Color: Black Package Contents: 3 x Protection Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.