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To celebrate my new Iphone and the fact that darkness is looming over me. I´ve done this: An induction powered yoyocharger for Apple. And since solarchargers don´t work at night or in Sweden half the year, this should be a smash hit. The induction technology is based on this.. And of course there is a small onboard LI cell to store the electricity generated. So no need to charge as you yoyo. Yoyo and then charge.