In this case, there is no way to charge, because the electric toothbrush, you can only choose to use the charging line to charge, if there is no charging line, it is recommended that you take a look from home to see if you can match a charging line, if there is no charging line, then you can only choose to replace the battery, each time after the electric toothbrush runs out of power, you can only choose to replace the same battery.