The low constant voltage value in the turbulent phase has a reference voltage of about 42.5V. If this value is high, the battery will lose water and it will easily deform the battery. This low value is not conducive to the battery being fully charged. This value is lower than 41.5V in the south; the gel battery is lower than 41.5V, as it is lower in the south. This parameter is relatively strict and cannot be greater than the reference value.