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.