Thanks Meter 43
Join Date: Feb 2012
Location: Fayetteville NC
The longer/thinner the cable, the lower the charge rate (Ohm's Law), so if you want a full charge rate with a longer thinner cable, it's not going to happen in a universe in which Ohm's Law applies. Either lengthening or thinning the cable increases the voltage drop across the length of the cable, so the current goes down. You can't push both ends of a see-saw down at the same time (without breaking something - the laws of physics, in this case).
A 26 gauge wire 3 feet long (that's 6 feet of wire, since it takes 2 to charge) drops 0.43 Volts at 1,800mA, so your 5.2 Volt brick is supplying 4.77 Volts at the phone - not enough for an 1,800mA charge. You can either increase the length and decrease the charge rate, use a thinner cable and decrease the charge rate or both increase the length and use a thinner cable and decrease the charge rate. But you can't increase the length, decrease the wire size, or both at the same time, and maintain the same charge rate (unless the brick is supplying far more voltage than is needed to give you the full charge rate - which would be a waste of money for the manufacturer and cause more heat in the phone during charge).