A typical lithium battery is charged at 4.2V.
General lithium battery charging has a protection circuit. This depends on the charging saturation cut-off voltage parameter of the selected charging protection IC. According to the selected protection IC, the full charge is generally between 4.15 and 4.3V.
Generally, the voltage of a single battery is 12v, which will be higher than 12v when fully charged and can reach 13v. For the pool, there are 48v, 60v, 72v, etc., and under normal circumstances, the full charge will be 5% to 10% higher than the rated voltage of the battery pack.