It can fill 15 pieces of 18650 power Li-ion batteries, But this is plastic shell, there is no battery inside. 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. Type C supports input and output.Automatically recognizes 5V/3.0A, 9V/3.0A, 12V/3.0A, 15V/3.0A, 20V/3.3A. Charging wiring method and circuit: The charger determines overcharging and overheating through ID and TH; C1, C2, C3, C4 identify cell voltage. Discharge wiring method and circuit: The machine identifies overheating through TH; C1, C2, C3, C4 identify cell voltage. Charging and discharging protocol: Charging and discharging support AFC/FCP/SCP/DRP Try SRC/PD2.0/PD3.0/PD3.1 protocol; Discharge supports QC2.0/QC3.0/QC3.0+fast charging protocol. Notes: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. Please be kindly noted: (1). PCB color may be any color according to our stock (2). PCB design may change with the same function and performance guaranteed. Preparation before assembly: (1). If a new core is used, please note: a. 18650 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. Note:Due to different production batches, some accessories have different colors and appearances, and their functions are the same; The color of the protection board is random, and the designation is not accepted. The appearance and typesetting design of the protection board are different, which does not affect the use. Colour:Yellow & Black Material:plastic Package Contents: 1 x lithium battery case with PCB 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.