DISCLAIMER: Improper use may damage charger source. I am not responsible for damage this mod may cause. Do this at your own risk.
We have half a dozen other threads in this forum about chargers for our N7s. The consensus is our N7s can benefit from 2A of current input into their mini-USB charging ports. In fact, they'll discharge even when plugged in with most chargers. The reason is the USB standard is only 0.5A, 5V DC, intended to protect devices like your computer from being damaged by supplying more current to connected USB devices. Keep that in mind if you do this cable mod. Mark your modified cable "for charging only," and use it carefully and wisely.
The problem with most 2A and 2.1A chargers is they only supply 2A to Apple devices like iPhones, using resistors and protective circuitry to know when an iDevice is connected. Other devices, like our N7s, only get 0.5A current out of the same charger.
One way to fool those 2A chargers into supplying adequate current to today's power-thirsty devices is to short the data wires in the USB cable. Here's how I made my cable, and the results.
I started with a USB extension cable (cablestripped photo), and clipped the green and white data wires (cableclipped photo).