Quote:
Originally Posted by Kolenka
Unfortunately, not all USB ports are created equal. There are high and low-power USB ports. Low power ports are spec'd to provide about 50-100mA of power, while high-power ports are spec'd to provide up to 500mA of power.
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Also some ports, especially on cheaper build or older machines, are actually a version of an unpowered USB hub and not full USB ports at all.
FWIW I've never had a problem charging via USB on any of the four machines I've tried it on.