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Fully Charged in Just 12 Minutes! Korean Scientists Develop Next-Gen Lithium–Sulfur Battery
(scitechdaily.com)
This is a most excellent place for technology news and articles.
The other thing for lithium is that its light, VERY light, which of course is ideal for hand sets. Manufacturers love the light and slim designs even though consumers would prefer to have a handset that can go 7 days without a charge