A modular medical device (10) (e.g. modular defibrillator/monitor) employs a primary medical module (30) including a primary power source (34) (e.g. battery(ies) and/or power supply) for powering an execution of a primary medical task assigned to the primary medical module (30) (e.g. electrical therapy) and a remote medical module (20) including a remote power source (24) (e.g. battery(ies) and/or power supply) for powering an execution of a remote medical task assigned to the remote medical module (20) (e.g. patient parameter monitoring). In operation primary medical module (30) ascertains if primary power source (34) has sufficient power or insufficient power for the execution of the primary medical task and remote medical module (20) controls a charging of remote power source (24) by primary power source (34) if primary medical module (30) ascertains primary power source (34) has sufficient power for the execution of the primary medical task.
