Described embodiments include a system, apparatus, and method. A described wearable power supply system configured to be usable after sterilization includes a portable energy source configured to supply electrical or radiant power, and configured to be carried by a person proximate to a first body portion of the person. The system also includes a portable power-output device configured to interact with a power-receiving device connected to a powerable handheld device, and configured to be carried by the person proximate to a second body portion at a position distal of a shoulder joint of the person. If interacting, the supplied electrical or radiant power is transferred from the portable power-output device to the power-receiving device. The system further includes a connective structure configured to transfer the supplied electrical or radiant power between the portable energy source and the power-output device.