Last night I didn't have a phone charger handy, so I plugged my iPhone into a USB-C PD battery pack.

I'm pretty sure that what happened here was:

  1. Quick charge for a bit
  2. Paused charging while I was sleeping
  3. Finished charging
  4. The battery pack used the phone's power to top off itself. (The phone wasn't even in use at this time)

๐Ÿ˜‚

iPhone battery history
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