Joined: Tue Sep 21, 2004 2:44 am
Location: Shanghai China
So Quickcharge 2.0/3.0 is different than what the iphone uses for rapid charging. Your best bet would be to buy a 2.1Amp car adapter, and get a good, low resistance cable. A low resistance cable would be one that's got thicker wires (which are a lower gauge/AWG). If I remember correctly, the iPhones use 2 pairs of resistors on the D+/D- lines in the charger to indicate the charge rate available, and many people online have reverse engineered the info needed to get high current charging from 3rd party chargers.
If you want to double check, they also sell USB current meters (USB Charger Coctor is one I use), which are incredibly useful.
I wouldn't worry about the 9V or 12V aspect if you get a normal USB charger.
Hope that helps,
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