DCB609 15 x 21700 Lithium Battery Case with For 20V 60V Li-ion Battery. It can fill 15 pieces of 21700 power Li-ion batteries. But this is plastic shell, there is no battery inside. 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, new, No Battery Cell !!!!!! DIY (semi-manufactured goods, No battery!) Advance notification: (1). To use this product, you need to have some professional knowledge and experience. We do not that you can use it well. (2). It requires you to have assembly tools. If you do not have these tools, please do not place an order! (3). The may not be exactly the same as shown in the following picture and may change with the batch. Notes: This battery case is only suitable for 21700 power cells! After combining the battery pack and this protective board, if there is no voltage output during the initial power on, please activate it with a dedicated charger. Preparation before assembly: (1). If a new core is used, please note: a. 21700 power lithium battery core must be , b. A group of battery 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. Note: 1. PCB color may be any color according to our stock, 2. PCB design may change with the same function and performance guaranteed. Color: Material: ABS Package Contents: 1 * Li-ion Battery Case 1 * PCB Circuit Board (random col, don't accept the specified color) 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.