Circuiting question... 3.7VDC 1100mAh charging?

I'm designing a charger for a device with a 3.7V 1100mAh battery. It's a "green" charger powered by wind, it needs to be able to be used with the device when it is being used, and operate at a variety of wind speeds, target range (5mph - 100 mph). I found a DC motor to use as a generator, that provides enough voltage, but lacks on current. The point is for it to supplement the current battery life, not replace the existing battery. Just looking for suggestions of components to use in the circuit. Any help or suggestion is appreciated.