I'm requesting help from anyone who might know of anyway to turn pedal-power to electricity for a small mobile device like a smartphone or mp3 player.
I came across this site, Convergence Tech, that offers similar to something what I'm looking at but in a smaller package if possible. Hopefully, it'll offer a USB or cigarette lighter input.
There are tons of information on the Internet for stationary bike generators. Some come prebuilt while there are DIY options.
For now, I think the easiest option is for me to carry around an external battery with a solar charger.
Note: I know its possible for bikes to generate power for a headlight. I suppose it's possible for that energy to be converted and stored in a portable battery unit.