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A comment on The price of lithium-ion batteries has declined by 97% in the last three decades. Parent comment

Re:The price of lithium-ion batteries has declined by 97% in... by tohmasu on Tuesday June 08, 2021 @07:13AM (#27433561)
>Otoh sitting in the sun for a few hours to charge some battery via rays from the sun is itself free.

Sounds wonderful, please show the math.

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