While renewable energy sources like solar and wind have now become cheaper than fossil fuels, developing long-term energy storage is key to overcome their intermittency. Lithium-ion batteries are the state-of-the-art battery technology but they can only cost-effectively provide energy for about 6 hours. So, what if we could extend the battery duration to 100 hours ... out of thin air … and rust? Literally!

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With Mini EV popping up on every continent it's good to know which ones are truly futuristic and which ones are just duds. That's why we created this video on the Top 10 Mini Electric Cars.

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This aircraft can travel at 180mph and has 2.5 times the range of Opener's BlackFly. It also uses less than half the energy per mile of travel than a Tesla Model S. It is fully electric and of course, it can take-off and land vertically.

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An electric-car battery can weigh thousands of pounds. As more electric cars hit the road, the race is on to find a sustainable way to deal with these batteries once they die. One startup uses a high-tech shredding system to recycle battery waste. But it can't recover all the valuable metals from it just yet.

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The Hongguang Mini EV Mini EV in China sold 35,169 units in September. These sales numbers are up 75 percent year-over-year. Cumulative sales of the model have exceeded 400,000 units since deliveries began in July last year.

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