hey, thought about the electronics forums but though you guys would have more experience. Looking into a dynamo. I found a couple that use the chain (gear and a guide) on the back of the frame. I found a couple that are a front hub unit. Any exerience with these, any other options? What is working well for you guys for the long hauls.

I am primarily looking to power my phone for GPS. also wanting to be able to power a front and rear light as backup. was hoping to run it through a small pass through battery. That said i trust equipment, like a dynamo, more than a battery, less of a disposable item.

update 9-5-2017 Well for now I am going to HAVE to get a battery pack pronto. Did a 34 mile ride today started at 98% was down to 10% by the time I got home, thats no good.