This paper proposes a concept of quite realistic energy management system for mobile devices. The proposed system does not restrict the users to be conscious about charging their mobile devices since the system is fully automated based on the novel automatic charging method. The automatic charging could be possible in two patterns, charging robot or automatic replacement. The charging robot is the mobile wireless power station which comes close and charge the mobile device automatically. Automatic replacement is just a concept to replace the mobile device automatically. This could be only possible in case the mobile device is sharable and could move autonomously. In response to this, as an application of automatic replacement, an energy management system for micro personal vehicle is introduced.
