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GM and Nissan hope to reduce costs by reusing depleted batteries.
Battery breakthroughs could lower costs and improve performance for electric vehicles and renewable energy storage–but commercializing these new technologies will be challenging.
Lithium-ion batteries with nanotube electrodes could go longer between charges.
A metal pad that can recharge devices placed on top of it has come to market.
Diesel-battery generators could cut troop fuel use at least by half.
Electric cars arrive, and solar, batteries, biofuels, and engines all advance.
Combining different battery technologies could improve vehicle performance and reduce costs.