A modular medical device (e.g., modular defibrillator/monitor) employs a primary medical module including a primary power source (e.g., battery(ies) and/or power supply) for powering an execution of a primary medical task assigned to the primary medical module (e.g., electrical therapy), and a remote medical module including a remote power source (e.g., battery(ies) and/or power supply) for powering an execution of a remote medical task assigned to the remote medical module (e.g., patient parameter monitoring). In operation, primary medical module ascertains if primary power source has sufficient power or insufficient power for the execution of the primary medical task, and remote medical module controls a charging of remote power source by primary power source if primary medical module ascertains primary power source has sufficient power for the execution of the primary medical task.
