Originally Posted by
WhyFi
This is a rather good idea, although I wonder if the power requirements could be met with something other than a hub. I have a PowerTap, and it's great, but being tied to a specific wheel is kind of a pain. I can't imagine that it would take TOO much power, I wonder if those generators with the spoke magnets would suffice.
Considering how long a charge on these batteries lasts, one could wonder if solar power would work. Then again, building a charging mechanism into the bike probably adds a good number of extra grams, and considering Di2 is already relatively heavy it may not be a good idea.