BL4040 BL4025 Plastic Case ( no battery cell ) and PCB Circuit Board For MAKITA 40V 10-core Li-ion Battery. This product is componentwithout battery core. Brand New,No Battery Cell It is used to repair and assemble batteries pack, only for people who are familiar with battery performance and have practical experience in battery assembly. It can fill 10 pieces of 18650 li-ion batteries, But this is only a shell, there is no battery inside. 18650 power lithium batteries must be used, and it is recommended that the discharge rate be higher than 15C, and the discharge rate more than the =15C. A set of 10 iron cores must be equipped with resistors and capacitors to make their voltages the same. Make sure that the voltage of each cell is the same before soldering the PCB. Colour:black Material:PCB+Plastic+Metal Package Contents: 1 * Battery Storage Box (Batteries not included) Note: 1. there are no batteries in the package 2.If you need batteries, please don't place orders 3. If you don't have the knowledge of battery assembly, please don't place an order 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.