Different components in a wireless transceiver are powered using different power supplies. For example, one or more first tasks in the wireless transceiver can be powered with a Galvanic cell, and one or more second tasks in the wireless transceiver can be powered with a fuel cell. The one or more first tasks could represent higher-current or intermittent tasks, and the one or more second tasks could represent lower-current or continuous tasks. The one or more first tasks could include transmission of a radio frequency (RF) signal, which may involve RF signal modulation or RF signal amplification. The one or more second tasks could include RF signal tuning, RF signal reception, RF signal demodulation, analog-to-digital conversion, digital-to-analog conversion, digital signal processing, operation of a controller, illumination of a display, operation of an audio speaker, operation of a microphone, or operation of a keypad.