Note: due to different production batches, the printed characters are different, which does not affect the use. BAT618 PCBA For 18V Li-ion Battery (no batteries) DIY (semi-manufactured goods) Advance notification(Very Important): (1). To use this product, you need to have some professional knowledge and experience. We do not that you can use it well. (2). You must have 10 pieces of 18650 Power Li-ion Batteries(discharge rate 15C). (3). You must have the tools such as spot welding machines, soldering irons, multimeters, and suitable chargers, etc. (4). This product has no after-sales service. No-Original, , No Battery Cell !!!!!! Preparation before assembly: (1). If a core is used, please note: a. 18650 power lithium battery core must be (discharge rate 15C) 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. Color:As Shown Material:PCB Package Contents: 1 * Protection Circuit Board 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.