I am looking for a inexpensive device that I can purchase so I can charge a simple cell phone from my dynamo hub when I am touring. I have a Shimano 3n72 dynamo hub which I use for a headlight and tail light. On Amazon I found a LightCharge USB charger for $68. I am wondering if this would work. I am also curious about how I would hook this up. I am fairly illiterate when it comes to electronics. Any direction would be greatly appreciated.