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Battery Charger Gadget
Did you ever found out in the middle of working you have almost no power left on your laptop? If yes, then this interesting 
gadget I saw is just the right thing for you. The peddle charger is a mechanical (kinetic) power based gadget so you will get the power for as long as you are physically capable to activate it.
The only problem with this peddle, which I think will make it useless to many people is the fact that it is a bit big – its size is : 170 X 184 X 49 mm, but for those of you who can’t afford losing the power while working on their laptop this is a nice solution.