energy change / sports goods

In the next 50 years, with the population expansion and economic growth, global demand for power will increase 2-3 times. More and more green energy is expected to fill the energy gap.
This is a portable charging tennis racket whose handle can be unscrewed and be put in the bag easily. So, this design solves the inconvenience of carrying tennis rackets, reduces the space occupied by the racket.
Moreover, when play tennis, tennis racket changes kinetic energy into electricity and stores them. After play, the stored energy in the handle is able to recharge the mobile phones, MP3, MP5, PSP, digital cameras and other small electric devices.