Qualcomm marketing manager PJ Jacobowitz writes:
Quick Charge 1.0 makes all this is available to the user with existing USB charging accessories — no new cables and wall chargers to buy.
OK, so I don't need a charger with a special Quick Charge logo or anything. Good.
Still, surely an underpowered charger won't allow the phone to charge as quickly as possible. OK; what charger do I need?
Android Authority contributor Rob Triggs adds:
Qualcomm’s Quick Charge 1.0 technology was designed to maximise charging efficiency for up to 10 watts of power, by allowing for a maximum current draw of 2 amps through a standard USB adapter and port voltage of 5 volts.
Though Android.SE user "TurboFool" warns:
Nearly all chargers that advertise themselves as 2.1A are optimized for iProducts, which require a different grounding scheme in the charger to reach their full speed, and that same scheme limits Android devices to 500mA. So counter-productively you'll find that most 1A chargers will charge your Android device faster than 2.1A chargers. [...] The way around this is to buy a charger that's specifically designed to adapt to whatever device you're using.
Ah. So I'll need a charger which is able to provide 2 amperes even to my device. (Related question: "How can I tell how many milliamps my phone is drawing from the attached charger? Preferably without having to use a multimeter.")