I ran into an issue with these, including the supplied Samsung cable, early on with my Note2. I discovered that the cable was a relatively small gauge cable. Most USB cords you buy are going to be a 28g or smaller(larger number) and sometimes has trouble getting the most current through the wires to charge your phone quickly.
I bought what are called 28/24g cables and noticed a significant increase in the charging current going to my phone. They are noticeably larger than the typical USB cable. I bought a few of varying lengths via Monoprice and from 2ft to 16ft, I got between 900mA up to around 1800mA initial charge rate. The most I was able to get from the standard and stock cables was around 800ma max.
I use the app: Galaxy Charging Current that measures the current going into the phone when the USB cable is plugged in. When I've got it plugged into the USB2 ports on my computer using either standard or larger USB cable I get a steady 466mA. When I use the Samsung wall plug, or any other 2.1amp charger, I notice a pretty big difference between the two sizes. Bigger is Better.
Just think of the example of a water pipe. The bigger the pipe, the less resistance to flow, the more water that can flow through it. Current is the water.
To remember gauge size. Think of a 1 inch circle and you're trying to put as many smaller circles into it. The greater the number of circles, the smaller you have to make them, hence to get "MORE" circles, say 28, you'd have to draw them smaller. If you only drew 24 circles inside that same 1 inch circle, they would be larger circles. Here's a photo of wire sizes to give a better example
View attachment 191799
Hope this helps.
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