I discovered today the awesome homemade invention of MintyBoost, the portable USB device charger encased within an Altoids can. You can buy a kit on Makezine.com (http://store.makezin...TY&Show=ExtInfo), but I have also seen creations that are more powerful, such as on this site (http://www.i-hacked....ent/view/53/90/). Now, I would like to combine the two: the ability of USB of the buyable one, but the mass power source of the other would be great too. Now, how DO I add the extra 2 9V batteries to the kit I can buy, but still make sure it's safe and won't overheat, or whatever bad thing that can happen.
If there are any hardcore geeks out there that can make this happen, you would be thanked by everyone, because these little suckers look like a great investment.