> Or you can just purchase an Ampy Move (www.getampy), an external battery pack powered by kinetic motion.

That gadget is way expensive for what it does (around $90) and the reviews are less than stellar. Furthermore, some reviews state that it takes around 60 hours of running to get the ampy move to store a measly 1800mAh.

For $1 you can purchase cell phone chargers that take standard AA batteries. For a bit more, but still a fraction of the cost of a Ampy move, you can purchase a rechargable cell phone charger.

I don't see a single category or use case that the ampy move works better than the alternatives, which cost a small fraction of its cost.