Originally Posted by Becca
I'd rather use an extra seat bag attached to my head- and down-tubes to hold the battery - which is what I did with my home-brew setup. I'm thinkin' about cracking open the case on my NH battery (I've already screwed the warranty anyway, might as well mess with it until it works the way I want!) and put it into the bag.
Be sure that whatever setup you arrive at is waterproof. Condensation and simple downpours can lead to interesting results!