University of Belgrade invented "Strawberry tree" which is tree kind of structure for charging mobile phones public. It is in Serbia. People can regularly charge their mobile phone batteries with clean and ecological energy produced from sun. This tree has diff type of mobile ports to charge diff type of mobile phones.
This tree takes energy from sun and stores in its internal batteries. So the time when sun is not there, people can still make use of solar energy stored in batteries.
See link for details-
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