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Old November 14th, 2012, 03:00 AM   #2 (permalink)
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There is a difference, the AC adapter supplies about one amp, a USB socket supplies half that.
However, on AC the phone will charge fully in much less than half the time it takes via USB. This is because the charging curve for Li-ion batteries is not linear, the first 80% (approx) happens at a much faster rate than the final 20%.
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