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Tesla Shareholders Approve Musk's $56 Billion Pay Package in Early Voting
(www.ibtimes.co.uk)
This is a most excellent place for technology news and articles.
Sodium batteries are cheaper and less volatile I believe but they're also much less energy dense meaning you need a heavier pack to get a similar amount of range (which also reduces range from the extra weight). I think they're better suited for stationary applications like solar banks and other energy storage solutions.