The future is already here. If it is true that the smartphone latest generation require more and more energy, and greater recharge cycles, it is also true that science and technology are making great strides to look for new alternative sources of energy.
An example are these shoes that allow you to recharge your smartphone while walking. It's called Vibram Hero, and it's a shoe that allows, through a special technological innovation, to accumulate electricity every time its sole is subjected to the pressure of the body, therefore every time you walk or run. It is a whole idea Italian company, made by Vibram in collaboration with the American company InStep NanoPower.
You can accumulate up to 8 Wh of energy in about 8 hours of walking, enough power to recharge, for example, a smartphone or small appliances. To be exploited is the kinetic energy, which is generated during a walk or a run: it is transferred to an accumulation system inserted in the shoe. In this way, part of the energy produced is recovered and transformed into electric current. The solution is particularly interesting for wearable devices such as SmartWatch e smartband, which do not consume too much energy and which accompany us at any time of the day.