![]() Since each "unit of load" is 100 mA for USB 2.0, a USB port must supply "at least" 500 mA, which means that it can supply more, usually much more, 2-2.5A, even if it is a normal, non-charging port. Quite contrary, according to USB 2.0 specifications, Section 7.2.1, if a USB host is powered from AC or a big battery, so-called "high-power" host ports must supply AT LEAST "5 units of load". ![]() ![]() ![]() There is no physical 0.5 A "cap" on USB port power. ![]()
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