Stanford scientists calculate the energy required to store wind and solar power on the grid

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Conventional lithium-ion batteries last about four years, or 6,000 charge-discharge cycles. Lead-acid batteries only last about 700 cycles. To efficiently store energy on the grid, batteries must endure 10,000 to 18,000 cycles…
http://news.stanford.edu/news/2013/september/curtail-energy-storage-090913.html

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