How is the i10tws headset charging box full?

If the charging case of the i10TWS is not powered, you only need to insert the delivered TYPE-C charging cable into the interface at the bottom of the charging compartment and turn it up from the bottom up :

The first one is flashing at the bottom, when the first light is not Flashing, the second light starts to flash, knowing that the fourth light does not flash, the four lights are all green, indicating that the I10TWS charging dock is fully charged.