Anker Quick Charge 2.0 18W Charging Times

I was using the LG G4 standard charger which was taking quite a bit of time to charge my G4.
I purchased the Anker Quick Charge 2.0 18W (see the link below) 3 weeks ago to take advantage of the LG G4 quick charge 2.0 capability, which charged my G4 much quicker. Last night I decided to chart down the times & percentages which I listed below, from 10% - 100%.
I'm using the OEM USB cable which came with the LG G4 because it is slightly longer than the Anker USB cable, and it also has the little nubs on it so you can feel it's inserting into the USB port properly.

10:50pm - 10%
11:00 - 22%
11:10 - 35%
11:20 - 47%
11:30 - 60%
11:40 - 73%
11:50 - 85%
Averaging approx. 12.5% charge/10 minutes
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12 Midnight - 93%
12:05am - 96%
12:10 - 98%
12:15 - 99%
12:20 - 100% (G4 LED green)
Takes approx. 20 minutes for the last 7% charge

http://www.amazon.com/gp/aw/d/B00Q88...seL&ref=plSrch