A charge method, an adapter and a mobile terminal are provided. The method includes: after an adapter is coupled with a mobile terminal via a charging interface, communicating, by the adapter, with the mobile terminal to determine a charging mode, in which a power wire in the charging interface is used for charging a battery, a data wire in the charging interface is used for communication between the adapter and the mobile terminal, the charging mode includes a quick charging mode and a conventional charging mode, a charging speed in the quick charging mode is greater than that in the conventional charging mode; under a situation of determining to charge the battery in the quick charging mode, communicating, by the adapter, with the mobile terminal to determine a charging current corresponding to the quick charging mode; adopting, by the adapter according to the charging current corresponding to the quick charging mode, a unidirectional pulse output current to perform a quick charge on the battery.