Did you know that there are currently three specifications for USB, USB 1, USB 2, and USB 3? Each version upgraded the standard for faster data transfer and power capabilities among other features. In 2007 a new rule further defined different types of USB ports, specifically the addition of a "dedicated charging port." The charging port can supply more power than a standard or charging "downstream port" and thus charge your USB device faster.
In the USB 1.0 and 2.0 specs, a standard downstream port is capable of delivering up to 500mA (0.5A); in USB 3.0, it moves up to 900mA (0.9A). The charging downstream and dedicated charging ports provide up to 1500mA (1.5A). - ExtremeTech
We upgraded our chargers around the home and the difference in speed is astounding. It's well worth the nominal upgrade.
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