Fast-charge-and-discharge portable power source

The utility model discloses a fast-charge-and-discharge portable power source, comprising a step-up charging circuit connected with an input port and a step-down discharging circuit connected with an output port. The step-up charging circuit and the step-down discharging circuit are connected with a battery pack charging input and a battery pack discharging output respectively. The fast-charge-and-discharge portable power source also comprises a control circuit which is connected with a battery pack through an electricity detection and display circuit. The control circuit is in circuit connection with the step-up charging circuit and the step-down discharging circuit. When the input port is connected with an external power adapter, the external power adapter can output proper voltage for rapidly charging the portable power source according to data between the external power adapter and the control circuit. When the output port is connected with electronic equipment, the portable power source can output proper discharging voltage for charging the electronic equipment according to data between the portable power source and the electronic equipment. As the external power adapter or the portable power source can output proper charging voltage or discharging voltage according to the data between the external power adapter and the control circuit or the data between the portable power source and the electronic equipment, the optimal power input and output can be selected, time for charging the portable power source or the external electronic equipment is shortened further, and the charging or discharging efficiency is improved.