What is the most powerful battery in the world?

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Zack Bennett is the creator of the Backyard Revolution. He is a simple carpenter who got the idea for this product when someone broke into his home one stormy night shortly after the power went out. This drove him to come up with an alternative energy option for himself and others. The basic concept of this product was inspired by solar power. When he discovered how expensive it would be to install a solar power system on his home, he started coming up with his own unique ideas.

http://www.youtube.com/watch?v=YoNvdOv8NWY