My experiment with iPad + Pencil battery drain surprised me
I was curious about how some cases, like my Zugu case, have a plastic layer between the pencil and the iPad while it’s charging. I wanted to know whether this layer caused made any difference to the idle battery drain of the iPad, so for the past three nights I went to sleep with both iPad and pencil at 100% charge in three different conditions, and recorded my iPad battery levels:
Pencil attached with Zugu Case: 8% drain over 8 hours
Pencil not attached: 1% drain over 8 hours
Pencil attached with no case: 2% drain over 8 hours
This suggests that the plastic of the case between the iPad and the Apple Pencil causes a significant increase in the idle battery drain of the iPad.
It occurs to me that I didn’t pay attention to what apps may have been active in the background. I’m not sure how that works, or if apps continue to be active at all while the device is locked. If anyone has a suggestion for repeating this experiment with a more consistent iPad state, I’m open to trying again. Perhaps shutting off the iPad completely, and turning it back on, before starting the timer?