What is the difference of 3.7V glue gun and 6V glue gun? This is directly related to the working voltage of the electronic components of the glue gun. In addition, if the voltage is low, the working temperature will be very low, which is conducive to longer life. Besides the battery capacity is larger, the size of the glue gun is larger. It is not convenient for carry out. In a word, the voltage should be determined by various factors, and you can choose the suitable glue gun according your demand.