This standard establishes a normative defi nition of communication between devices containing a power source (agents) and managers (e.g.@ cell phones@ personal computers@ personal health appliances@ set-top boxes) in a manner that enables plug-and-play interoperability. Using existing terminology@ information profi les@ application profi le standards@ and transport standards as defi ned in other ISO/IEEE 11073 standards@ this standard defi nes a common core of communication functionality of personal health devices (PHDs) containing a battery@ including: 1) current device power status (e.g.@ on mains or on battery); 2) power charge status (e.g.@ percent of full charge); and 3) estimated time remaining (e.g.@ minutes). Purpose This standard addresses a need for an openly defi ned@ independent standard for power status information exchange from PHDs to manager(s) (e.g.@ cell phones@ personal computers@ personal health appliances@ and settop boxes). Interoperability is the key to growing the potential market for monitoring the power status of devices and enabling people to be better informed participants in the management of their health.