It can fill 10 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/ Try /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