The range of the power supply voltage of the DS2784 is 2.5V to 4.6V, which means the voltage of the charger cannot exceed 4.6V, otherwise the DS2784 may be damaged. During charging and discharging, the two MOSFETs are open; otherwise the current cannot flow into or out of the battery. During charging, the charging voltage will be pulled down by the battery after being applied to the battery, and it will gradually be increased as the battery is being charged.