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Can we store wifi and use it later?

I started using WIFI almost 8 years back (in 2006) when I moved to the UK. Before that, during the engineering degree I studied about WIFI energetically for achieving grades. Nowadays it’s a common friend and every day without her presence, it is awful to envisage. One day my data allowance on the mobile run out and I want to go to an event in central London and want to use the GPS. I had to take map printout and follow the route. I depend a lot on GPS navigation rather than a paper map. So I reached the location half an hour later in the event. Eventually I missed the event and while walking back to the tube station I was thinking about storing the WIFI somehow and using it later, like a battery. People might think why can’t I carry a portable modem and a laptop, but I am thinking about much sophisticated device than that like a battery for the phone.
Did anyone think about a life without batteries now? It is there since most of us on this planet born. In 1749 Benjamin Franklin first used the term "Battery". Ever since it started accruing and become part of everyone, from portable computing devices, mobile phones, electric cars and almost all the devices we are using today. For me the first memory is about a car that run using remote-control (gift for my cousin from his working abroad father).
Is it possible to invent a storage mechanism for WIFI? I don’t know, my connection with electronics is too poorer rather than using the electronic devices. But that day I wished if I have a device or a ‘mechanism’ to store the WIFI and use it later. Like the way mobiles/laptop/ ipad’s are recharging we charge the WIFI device in the  evenings and use it throughout the next day. Then we don’t need to worry about the big bills, these corporate mobile providers are sent at the end of the month.
Think about it and share your thought.

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