This product is a component without a battery core. It is used for repairing and assembling batteries, only for people who are familiar with battery performance and have practical experience in battery assembly. For V6 Preparation: First. If a new core is used, please note: 1. Please use a 18650 lithium battery with high power and small internal resistance, the same model and parameters, do not use ordinary lithium batteries for energy storage 2. Please test the voltage of a single 18650 battery and charge the single battery so that the voltage of each 18650 battery is the same. The cell voltage of the 18650 battery must be higher than 4.1V Second. 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 at the same voltage value. Very important: Make sure the voltage of each 18650 cell is the same before soldering the PCB. The voltage of the 18650 battery cell must be higher than 4.1V The appearance and