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Why are Batteries so Primitive?

Every Wednesday, Michio Kaku will be answering reader questions about physics and futuristic science. If you have a question for Dr. Kaku, just post it in the comments section below and check back on Wednesdays to see if he answers it.

Today, Dr. Kaku addresses a question posed by Felipe Cespedes: 

Why is battery or portable energy technology so primitive? 

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