The identification methods of positive and negative electrodes of 2.5mm DC charging plug are as follows:The positive and negative of the charging plug depends on the wiring order of the live and zero wires in the access wire.One end of the wire is positive and the other is negative.The charger is a high frequency power supply technology, using advanced intelligent dynamic adjustment dynamic adjustment charging technology.Power frequency machine is designed based on the traditional analog circuit principle, the internal power devices (such as transformers, inductors, capacitors, etc.) are relatively large, generally when the load is larger, there is less noise.