Charging from Laptop USB Port
When I am in the office I have my OGP connected to my laptop's USB port using the USB cable that came with my OGP. Each time my OGP tells me I am slow charging, which I interpret as I am not pulling enough power. Recently I bought a Energizer Energi to Go kit, which has its own USB cable and different tips for charging different type devices. When I use the combination of the micro-USB tip and their USB cable I do not get the same slow charging message from my OGP. I interpret this to mean that I am pulling 2.1 mAh to charge the device quickly.
My question is why wouldnt the USB cable that came with my OGP support this also? Does the cable really determine how much juice I can pull to charge a device?