[i1856511]

I'm confused about this:

  You can also charge both if you attach your MagSafe Battery Pack 
  to your iPhone, then plug your iPhone into a power source. You 
  might want to charge this way if you need to connect your iPhone 
  to another device while charging, like if you're using wired 
  CarPlay or transferring photos to a Mac.

Does this imply... if you MagSafe this to your phone, and then connect the Lightning cable to the Battery Pack to charge, the Lightning port on the iPhone cannot be used for CarPlay? Does it get turned off?

[vlozko]

It means if you’re using CarPlay, you can charge the phone and the MagSafe. It’s trying to say that it’s safe to charge your phone while plugging the cable in for purposes other than explicit charging.