, No Battery Cell! This product is component without battery core. 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. Lithium battery shell sleeve is suitable for Bosch 10.8V12V BAT411 BAT420 BAT412A BAT413A lithium battery, it can fill 6 pieces of 18650 li-ion batteries. This is only a shell, there is no battery inside. 1. What should be paid attention to when assembling tool battery pack?18650 power cell, model, voltage, internal resistance should be consistent, consistency is better, 10.8V 3 strings, 14.4V 4 strings, 18V 5 strings. The voltage detection line must be connected to the detection line. Try to use better batteries instead of dismantling the electric core. Need spot welder. 2. When the protective plate is used to replace the Before changing the protection board, be sure to measure the voltage of each group of 18650 cells to ensure that the cell voltages are consistent. The protection board only plays a protective role and cannot balance the voltage. The battery cannot be charged or discharged due to the inconsistent voltage of the battery pack. It is useless to replace the protection board. It is recommended to use 18650 batteries. Please be kindly noted:If you have any objection to the following two items, please do not order! PCB design may change with the same function and performance guaranteed. Color: black Material: Plastic Package Contents: 2 x 6-cell lithium battery case with protective plate (the color of the protective plate is random, no specified color is accepted; the printing screen on the protective plate is random, no specified printing screen is accepted) Only the above package content, other products are not included. Note: Light reflection 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.