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by morsch
4340 days ago
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At 100% efficiency, much less than a cent. http://www.wolframalpha.com/input/?i=5.45+Wh+*+%280.26+EUR%2... No clue how efficient typical USB charging is, the AC-DC conversion is at around 80%, then you've got the battery chemistry which cursory research seems to peg at around 80% efficiency as well. So lets say it's about 1c per charge, at EU power prices. |
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