1. -in IC detects cell voltage current. And remember the number of uses! 2. Detection and protection battery:Overheat protection, overvoltage protection, undervoltage protection, overcurrent protection, overcharge protection. 3. all the new series of achieve low voltage shutdown. Cooperate with many tool factories! 4. PCB design may change due to changes in the supply chain and processing technology. 5. Suit for Zhipu Hongsong Jingmi (no Original ) 18V Lithium Battery; note: 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. Preparation before assembly: 1. If a new core is used, please note: (a). 18650 lithium battery core must be ; (b). A group of six cores must be equipped with resistance and capacitance to make their voltage the . 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 voltage value. Very important: the voltage of each cell is the before welding PCB. Specifications: 10-Hole colour: black Material: plastic Package Contents: 1 set x Battery Case Due to Different production batches, Some accessories have different colors and appearances, but have the function Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.