The bike charger relies on the well tested and durable bottle-dynamo to convert your pedaling into power, and the phone is held to the handlebars with a big rubber-band. In between is a box of circuitry to give a nice smooth current to any device equipped with a 2mm jack.The charger will first be available in Kenya for around €15 $18 and will go on sale worldwide by the end of this year. So how much power can our legs produce? Quite a lot, surprisingly Pedal at 6mph for just 10 minutes and you’ll get almost half an hour of talk time or a stunning 37 hours of standby. The minimum speed required to charge a phone is 4mph, or walking speed, so even a modestly jaunty commute should be enough to keep your cell going for a whole day.We like the simplicity of Nokia’s gadget Other solutions tend towards the complicated, with magnets or hub dynamos providing the juice With bikes, though, simple is almost always best.
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