Quick Charge 3.0 USB power analyzer

Upon plugging USB power from the Aukey Quick Charge 3.0 charger into the Quick Charge 2.0 capable device, a small fraction of a second is spent at 5 V input, while the Quick Charge 2.0 rate is negotiated. Starting from 20% charge, in less than 2 hours the device is completely charged. Battery charge of 20% → 60% is achieved in 40 minutes.

Quick Charge 2.0 voltage/current vs time: the table below is approximate, with the display off. At 100% charge, the rate bounced between 0.02-0.2 amps as the phone pings Wifi, checks for email, etc. Most of the time, it was at about 50 mA.

time [minutes]Charge %Input [Volts]Current [Amps]
1201009.130.05, peak 0.2