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2. Oppo - Wikipedia

   en.wikipedia.org/wiki/Oppo

   VOOC (Voltage Open Loop Multi-step Constant-Current Charging) is a fast charging method for Oppo phones unveiled in 2014. [ 18 ] [ 19 ] [ 20 ] VOOC comes in a few variations: VOOC 2.0 (2015), same as the first version that was introduced in 2014, which operates at 5V/4A.

3. Quick Charge - Wikipedia

   en.wikipedia.org/wiki/Quick_Charge

   Quick Charge is a proprietary technology that can charge battery-powered devices, primarily mobile phones, at power levels exceeding the 7.5 watts (5 volts at 1.5 amps) supported by the USB BC 1.2 standard, using existing USB cables.

4. Smartphone - Wikipedia

   en.wikipedia.org/wiki/Smartphone

   The smartphone's integrated charge controller (IC) requests the elevated voltage from a supported charger. "VOOC" by Oppo, also marketed as "dash charge", took the counter approach and increased current to cut out some heat produced from internally regulating the arriving voltage in the end device down to the battery's charging terminal voltage ...