Portable respiratory device for supplying respiratory gas to a living organism, comprising: - A housing , - A respiratory gas conveying device which is configured to convey inspiratory respiratory gas to a respiratory gas housing outlet of the housing , - An input/output device for the input of control commands and for the output of information, - A control device which is connected for signal transmission with the input/output device and with the respiratory gas conveying device , - A first, power grid-based power supply which is configured for current-transmitting connection with a power grid voltage source external to the respiratory device and which is configured and arranged for supplying the control device , the input/output device , and the respiratory gas conveying device with current, - A second, storage-based power supply which exhibits an electricity storage device for storing electrical energy and which is configured at least for supplying the respiratory gas conveying device with current, - A humidification device which is configured to humidify the inspiratory respiratory gas, where the humidification device can be supplied with current both by the first and by the second power supply , Where the respiratory gas conveying device , the input/output device , and the control device are accommodated in the housing , Where the second power supply exhibits a power supply housing separate from the housing of the respiratory device which is physically couplable in a detachable manner with the housing of the respiratory device for common movement, Where when looking at the operationally ready respiratory device , the second power supply is arranged under the humidification device , Characterized in that the first power supply is accommodated in the housing of the respiratory device , where the respiratory device can be supplied with electrical energy solely by the first power supply when the second power supply is separated from the housing of the respiratory device . - A housing , - A respiratory gas conveying device which is configured to convey inspiratory respiratory gas to a respiratory gas housing outlet of the housing , - An input/output device for the input of control commands and for the output of information, - A control device which is connected for signal transmission with the input/output device and with the respiratory gas conveying device , - A first, power grid-based power supply which is configured for current-transmitting connection with a power grid voltage source external to the respiratory device and which is configured and arranged for supplying the control device , the input/output device , and the respiratory gas conveying device with current, - A second, storage-based power supply which exhibits an electricity storage device for storing electrical energy and which is configured at least for supplying the respiratory gas conveying device with current, - A humidification device which is configured to humidify the inspiratory respiratory gas, where the humidification device can be supplied with current both by the first and by the second power supply , Where the respiratory gas conveying device , the input/output device , and the control device are accommodated in the housing , Where the second power supply exhibits a power supply housing separate from the housing of the respiratory device which is physically couplable in a detachable manner with the housing of the respiratory device for common movement, Where when looking at the operationally ready respiratory device , the second power supply is arranged under the humidification device , Characterized in that the first power supply is accommodated in the housing of the respiratory device , where the respiratory device can be supplied with electrical energy solely by the first power supply when the second power supply is separated from the housing of the respiratory device . <EOS>