The tension pair for this situation.
Generally, the charging port voltage of the lithium battery is indeed lower than the discharge port voltage, but not necessarily half. This is because during the charging process, the charger converts alternating current into direct current and adjusts the voltage through the charging port to a voltage range suitable for charging lithium batteries.
During the discharging process, the output voltage of the lithium battery will change according to the remaining battery power. Generally, when the battery power is sufficient, the discharge port voltage will be close to the rated voltage of the lithium battery; When the battery power is low, the discharge port voltage will decrease accordingly.