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As the world starts weaning itself off fossil fuels, batteries have emerged as a crucial component of a future powered by electricity. And that has sparked a global contest to dominate battery technology.  Quartz reporter Akshat Rathi discusses with membership editor Sam Grobart what he learned over the past year as he traveled from Shenzhen to San Francisco to report on the key players in the industry, and the current state of the technology, in this members’ only conference call.