Originally Posted by
lhendrick
A hub dynamo and cache battery lets me recharge my iPhone and my Garmin Edge 810 so I am never without navigation and communication assistance. I like it that way. Your mileage may vary.
That's what I do too. But the way things are improving with battery technology, you hardly need the dyno anymore. My cache battery is currently a mophie juice pack powerstation xl. I can get 6-8 full charges of my iphone on a charge of that cache. A charge will typically last me 24 hours even with a lot of GPS, etc. Since I'll stay in a motel every few days touring, or at least find a painless plug-in opportunity, I would not really need the dyno.
It's nice to have but less and less important.
Edit: I use only the iPhone, no Garmin Edge