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post #9 of (permalink) Old 06-01-2019, 12:09 PM
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The "typical" 5V USB chargers are either 1A or 2.1A. Both are slow by modern standards.

MOST USB-C equipped phones support "USB-PD" (power delivery) and most modern Android devices support some version of Qualcomm's "Quick Charge". Apple has their own which is different, of course, being Apple. All three are MUCH faster than 1A, materially faster than 2.1A, and produce less heat since they have voltage-stepping that better matches to the charge profile the battery actually requires. USB-PD is the fastest and better-quality PD adapters can charge modern laptops with USB-C power/data ports as well.

I have this adapter in my Sport plugged into the "lighter" socket; it is thus "switched" and turns on and off with the vehicle:

This is one of the VERY few car adapters that supports PD @ 20V, which is required for most laptops that have USB-C power supply ports to charge. MOST car adapters are limited to 9V/3A on PD and while this will charge phones very quickly the output voltage isn't high enough to charge laptops. The buck/boost power supply required to get over the 12V supply voltage costs more money. The same is true, incidentally, for power banks -- most of them have their battery packs wired internally as 12V and thus *cannot* charge devices that require either 15 or 20V PD supply voltages.
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