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When charging I have noted a difference between chargers and cables. Some combinations seem to not want to charge above 98%, even if left plugged in overnight, while others reach 100% charge level fairly rapidly on Kindles which give a % charge readout. Just due to manufacturing tolerances I would think that there is some variation in voltage out of USB chargers and cable resistances. USB cables, depending on age, have been designed for anything from 0.5 amp at 5 volts to 5.0 amps at 20 volts or 2.5 watts to 100 watts power ratings.
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