Metallic Power's zinc-air fuel cell could replace lead-acid batteries when higher specific energy, greater energy density or very rapid recharge is needed. Offering zero emissions and virtually silent operation, the Carlsbad, CA-based company says it could even replace the internal combustion engine. The system has two principle components — the zinc-air fuel cell and zinc refueling/recycling unit. A zinc-air fuel cell uses the same electrochemical process as zinc-air batteries. However, ...

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