The Anker cable I posted earlier has the correct resistor.

After talking to my friend, even if you had the incorrect resistor, you wouldn't harm your charger / computer if the battery charger ramped up the current. The USB spec writers are worried about charging time, so they stipulate you start at a high current and then ramp down. If you started low and then ramped up, most of the charger ICs monitor the charge voltage and then stops ramping when the voltage sags (either to high cable resistance or poor current capability).