Generator hubs have been used for decades to power integrated lights, but in a modern world, what you really need is a USB charger for your portable energy starved electronic devices. The BikeCharge Dynamo by Bike Console is an all in one bike light and power generator for any USB device.
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The integrated 1Q front LED and 2 S/B rear LED are adjustable, remote controlled, and weather proof. A 700mAH Li-ion battery stores power and will keep the lights powered for up to two hours after stopping.
The device can be easily installed by a home mechanic and allow tool free removal. The manufacturer claims it is 20% lighter than similar dynamos and has low load resistance. You’ll need to be cruising along a 5 kmh( 3 mph) in order for the device to work and full capacity is achieved at 20 kmh (12 mph) based on 26″ wheels.
Depending on your speed, you can fully satisfy your mobile phones battery gremlin after a mere 2-3 hour ride!
The kits retails for $100 and is available at BikeConsole