I'm not sure if each port has different port values as they aren't labeled so I suspect they are all low on power. Having read from several sources that batteries last much longer when charged more slowly with less current, I prefer these types of chargers. I haven't had any issues with any devices and my phone charges from around 50% fairly quickly. I also have an older iPad mini and it charges well. The power pin is oriented to work best with most of my extension cords.
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