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Old 01-24-2019, 01:13 AM   #135 (permalink)
freebeard
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Yet another contender, the carbon lead battery. Predicted by phys.org in 2011:

https://phys.org/news/2011-11-carbon...t-battery.html

Available as a [boat battery] product today:

https://duckduckgo.com/?q=Carbon+foa...sb&ia=products
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