Nokia has unveiled the first pedal-powered phone battery charger. According to the Financial Times cyclists will be able to plug their handsets into a charger mounted on their handlebars and connected to a dynamo that harnesses electricity from the wheels. It would take two-and-a- half hours for a cyclist riding at 15km an hour to fully charge a battery, the Finnish group said. It is hardly the kind of technological breakthrough that is likely to worry Apple, as Nokia struggles to find an answer to the US group’s iPhone in the crucial smartphone market. But the bicycle charger highlights efforts by Nokia to shore up its dominant position at the lower end of the market in the developing world, amid rising competition from cut-price Chinese handsets.