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by pascal_cuoq
4467 days ago
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You are right. Without even taking into account efficiency, “nine hours for 100 percent charge [of a 50 Whr battery] on a [5V USB] 1A power supply” obviously breaks the conservation of energy. The claim “4.5 hours for 80% charge” breaks it even more. They should make perpetual motion devices, not external batteries. |
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