Abstract: A multi-mode output charger is to support different kinds of batteries for the mobile telecommunication facility. It comprises a charger and a charge unit. Users can choose different charging voltages and charging currents with a voltage and current regulating switch of the charger. Therefore, the charger can support different voltage and current combinations for batteries. And the charge unit has several kinds of charge connecting set for different brand batteries. Also, the charge unit can extend to engage with different mode charge connecting set for enlarging its supporting range.