Ok, this isn't total geekiness, and I doubt it even counts as minor geekiness, but it has geek elements in it. I was curious to see if the Energizer Energy to Go battery packs for cell chargers would work to charge a Garmin 305, so I plugged it in tried it out. Not only did it work, with some help from velcro, I was able to run the GPS off of the Energy to Go battery pack while riding. No interference, nothing. So now I can run at night, with the backlight on the entire time, and not worry about the GPS crapping out halfway into the ride.