For 36V 18V MultiVolt MV Li-ion Battery ,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. It can automatically adapt to the voltage requirements of 36V and 18V different charging tools, and automatically provide two different output voltages, 36V and 18V, according to different products. Preparation before assembly: (1). If a core is used, please note: a. 18650 power lithium battery core must be ,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: that the voltage of each cell is the same before welding PCB. colour: Black+green Material: plastic Package Contents: 3 set x Li-ion Battery Case(Some accessories have random colors and styles, you can't choose the specified color style, the function is the same) 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.