If you bike often, then it might be a good idea to take all that extra energy you’re creating and put it to good use. Perhaps with the Siva Cycle ATOM, an efficient portable power device that can help ensure your devices have juice even when on long bike rides.
This lightweight bicycle generator and rechargeable battery pack will power virtually any of your electronic or mobile devices via USB and, as you ride, it harnesses the kinetic energy you generate. So it will keep on charging as you keep on pedaling!
The Atom easily mounts on most standard bicycle frames. It can give you more than a 100% charge on your dead iPhone anywhere you need it with the same 1000mA charge rate as if you were plugged into the wall.