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The overall efficiency from a power bank to a smartphone battery is about 2/3, according to this source: https://www.powerbankguide.com/powerbank-capacity-explained/ The amount of energy a batte...
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The overall efficiency from a power bank to a smartphone battery is about 2/3, according to this source: https://www.powerbankguide.com/powerbank-capacity-explained/ The amount of energy a batte...