A portable, rechargeable, discontinuous positive airway pressure (DPAP) device for use by an individual as a breathing assist device. The DPAP device comprises a sensor for tracking an exhalation phase of a respiration cycle of the individual relative to a stimulation period, E0. A stimulation source responsive to a sensor determination that the exhalation phase has entered the stimulation period, E0, to discontinuously deliver a stimulation, during the stimulation period, E0. A controller regulates the delivery of the stimulation by the stimulation source. A rechargeable power cell for power the controller. The rechargeable power cell includes a Seebeck element that is placed in contact with the individual's body for thermoelectrically converting the individual's body heat into an electrical current that recharges the power cell.