In the car, we frequently charge our iPhone with USB-based cables, plugging one end into the device and the other into an automobile power adapter (with USB port) or the USB port on the Power Cup.
When we use the white, Apple-supplied cable, the phone refuses to charge.
When we use a cheap, black cable that came with a Belkin adapter, the phone sucks up juice like nobody's business.
If you've been having trouble charging your phone using USB-based adapters, you might try ditching the Apple cables for cheaper, third-party ones.
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