I bought three monoprice micro usb cables and use them on my laptop and in the car (with USB car charger). My USB car charger is rated at 1000ma (Belkin) but when i took a long enough drive, i looked at my Battery Graph app and noticed it only charged 16% over 30minutes. Now at home with the OEM wall charger and OEM charging cable I can charge about 50-55% over 60 minutes. So i tested the Monoprice cable with the OEM wall charger and came up with 16% over 30 minutes also. Tomorrow I'm going to take my OEM charging cable out to the car to see if I can get 1000ma.