I have an external battery that has two USB outputs. One is for normal charging and one is for fast charging. They should just bake it into the phones.
OK, so I think we may be confusing either ourselves or other members regarding the higher rate outputs of some chargers versus true "Rapid Charging" such as "Quick Charge 2.0" from Qualcomm (also known as "Turbo Charging" in the case of the Droid Turbo from Motorola), or the Samsung version of the same.
Quick Charging or Samsung's version both utilize not only higher current rates, but also either 2 or even three different voltages (as is the case with Quick Charge 2.0), and the charger and phone recognize each other and this triggers the rapid charging. The Qualcomm Quick Charge 2.0 charging process utilizes the three different voltages and amperages to set stages of charging rates. In the case of the Motorola Turbo, they've custom labeled them but they still meet the Quick Charge 2.0 standard. The three voltages/amperages are super-fast (AKA Turbo 2) at 12 Volts, 1.2 Amps, fast (AKA Turbo 1) at 9 Volts, 1.6 Amps, and Standard which is 5V 1.6 Amps (and also trickle).
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I have a portable charger like you mention and it has a 1 Amp and a 2 Amp port on it. This is not the same thing. Unless it says "Quick Charge 2.0" or something to that effect, the phone will only use whatever the maximum current load is specified by the phone (and battery) manufacturer, and will only draw as much current as it is capable of using. If the phone and battery are only capable of receiving 5V at 1.2A, then plugging into the 1A jack will charge slightly slower, and plugging into the 2A jack will only give it 1.2A.
Samsung created their own method of "Quick Charge" so they wouldn't have to use the Qualcomm processor and pay those royalties. This is a different technology but essentially operates the same way. Neither system will "Quick Charge" with an external battery pack or other third party charger, like mentioned above unless it is designed with that specific technology in mind.
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