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You will need to rectify and regulate the voltage output from a dynamo to charge a battery.IIRC the output from a bicycle dynamo is AC, (needs to be DC to charge a battery), and the dynamo voltage varies wildly depending on the speed of the rotor. [If your bke lights are LEDs rather than incandescent bulbs there will already be rectification and voltage regulation circuitry somwhere in the circuit]....sorry, you cannot view external links. To see them, please
REGISTER or LOGIN the iPhone battery is 3.7 volts.What do I need to do to make sure I don't over charge the battery?
What do I need to do to make sure I don't over charge the battery?