As some of you may know, some bikes already have a built-in pedal powered lighting system for back and front. Some Dahon folding bikes offer this.

But it would be fantastic to have a lightweight battery storage system for our pedal powering for any type of ride that we do and use that saved power for other things off-bike also.

Or hey, at least power up the helmet webcam! Or our digital camera on hand.

So many useful small-scale applications for cyclists.