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Cobalt supply seems a bit uncertain. One of the main sources is DR Congo. https://www.greentechmedia.com/articles/read/the-truth-about-the-cobalt-crisis https

• Gibbon1 8y ago
  Yeah a lot of people point at lithium as the scarce input. But Cobalt for common lion batteries is problematic because it's produced almost entirely as a by-product of copper and zinc (I think) mining. For the other metals used current production dwarfs the supply needed for batteries. However there are lithium iron phosphate batteries.