Breakthrough in energy generation for mobile or portable devices

Portable devices (telephone, GPS, Walkman...) are more and more popular and sophisticated. Thus they require more and more energy for comfortable use of new functionalities (TV on telephones, video on Walkmans). The problem of the too frequent energy recharges of these objects, which make them less and less "nomadic", is then a topical subject. Indeed, the interest of having the video-telephony on the mobile phone becomes very limited since it is necessary to recharge the device more than once per day. We will consequently study what is currently available on the market to provide the required energy, i.e. essentially the batteries. By observing that the batteries do not always constitute a satisfactory response to this problem, in particular from the point of view of their recharge, of their provisioning and, of course, of the environment, it is interesting to look at the most promising alternatives at short or medium term. And finally we propose to analyze the solutions suggested, in terms of use wished by the user.