dawupine for Makita BL1820B-2 BL1830 BL1815 with LED pcb bms case material BOX shell housing li-ion battery Drill /////////////////////////////////////////////////////////////// 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. /////////////////////////////////////////////////////////////// No Original,100% New, No Battery Cell it can fill 5 pieces of 21700 li-ion batteries with LED battery status indicator. But this is only a shell, there is no battery inside. Preparation before assembly: (1). If a new core is used, please note: a. 21700 power lithium battery core must be selected, b. A group of 5/10 cores must be equipped with resistance and capacitance to make their voltage the same. (2). If the old battery is repaired, please test the voltage at both ends of each cell. If the voltage is different, please charge each cell to the same voltage value. Very important: Ensure that the voltage of each cell is the same before welding PCB. 1. "PCB " Package include: As the following picture: no battery cell no battery inside 2. " BOX " Package include: As the following picture: no battery cell 3. " BOX - PCB " Package include: As the following picture: no battery cell Kindly reminder (Very important ): 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. 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