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Sunday, February 14, 2016

Product review: Charging results for Nexus 6p, Nexus 5, and iPad Mini with compliant and non-compliant USB 3.1 cables - Qualcomm Quick Charge 3.0 by Kungix




















This listing combines several different chargers. My review is for "Qualcomm Quick Charge 3.0 Adapter".

This wall charger has one port and has Qualcomm Quick Charge 3.0 technology. I tested this charger with Nexus 6p (using both USB 3.1 compliant and USB 3.1 non-compliant USB cables) as well as an older Nexus 5 and iPad Mini that do not support rapid charging.

Using Qualcomm Quick Charger
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' Nexus 5 was charged at optimal rate of 1.02A.
' iPadMini was charged at non optimal rate of 0.93A (which is typical rate when iPad Mini is plugged into a 1A port)
' Nexus 6p is capable of rapid charging when the battery level is low. I discharged the phone to 28% so the phone would do rapid charging if possible.
'Using Tenswall USB 3.1 compliant cable the highest current Nexus 6p was able to draw was 1440A
' Using PECHAM USB 3.1 non-compliant cable the highest current Nexus 6p was able to draw was 2260A

Using another charger without Qualcomm Quick Charge 3.0 chip
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For comparison I used a regular (non Qualcomm) charger
' Using Tenswall USB 3.1 compliant cable the highest current Nexus 6p was able to draw was 1320A
' Using PECHAM USB 3.1 non-compliant cable the highest current Nexus 6p was able to draw was 1700A

So it looks like that Qualcomm charger did significantly better with a non-compliant cable, but almost the same with a compliant cable. I repeated each test 4-5 times to be sure that the readings are consistent.

What is 3.1 compliant cable? USB 3.1 spec specifies that the termination resistor that advertises the maximum available current should be set at 22K which advertises 1.5A of current. Benson Leung has a series of excellent reviews of Type C cables. Benson works for Google's Pixel group and has pointed out that many type-C cables violate the USB 3.1 specification that states that the termination resistor that advertises the maximum available current has been set incorrectly at 10K which advertises 3A of current rather than the correct value of 22K which advertises 1.5A of current. The "bug" in non-compliant cables can be used as a feature of allowing rapid charging for Nexus 6p. The phone does not draw more than 2.5A so it does not damage the phone. The non-compliant cable could be harmful to devices that are not limited to 2.5A such as the ones that Benson evaluated in his reviews.

Using Qualcomm Quick Charger with Qualcomm Quick Chart 2.0 chip
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One other point of comparison is that Qualcomm 2.0 charger I have allows my PECHAM USB 3.1 non-compliant cable to draw 2500A. I expected that 3.0 charger would give me better or the same results.

I received this charger from Kungix for testing and review. For Android phone without rapid charging it worked the same as a regular charger. For iPadMini it only delivered 1A, so it was below average. For Nexus 6p this charger worked better under some condition than a regular charger, however not better than Qualcomm 2.0 charger.

You can find "Qualcomm Quick Charge 3.0" on Amazon via this link


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