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"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."
-Apple

This may not be the only questionable rumor. This charging thing could apply to other devices in an ecosystem-wide update to support reverse wireless charging. Got it from the inside, little birdie works at Apple. Can't confirm, but possibility. Look out.
 
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