I recently changed my iPhone XS for an iPhone 12 Pro and I'm loving everything of it except for the overnight battery drainage, which is somewhere between 20% and 30% (didn't see the exact percentage at night and at the morning).

  • This is what I saw in the morning one day after leaving my phone as I regularly do (no closing apps, no turning off wireless connections, etc...)
  • This is what I saw after force closing all apps and turning on low power mode
  • And finally this is the latest one with airplane mode enabled (all wireless connections disabled)

Things to consider:

  • This iPhone was iTunes-restored from the backup of my up-to-date (iOS 16.1.2) older iPhone XS
  • No, this is not photo indexing. This is happening for more than a week and my photo gallery is not that big
  • This issue didn't happen in my iPhone XS (both have a battery health of 100%)

If you see in the videos, nothing happens overnight, there seems to be "no culprit" yet the battery is draining. I don't consider this normal since my iPhone XS battery chart was flat overnight, maybe down 1%-2%.

How to diagnose this problem? Is there a way to find what's happening with the battery when there seems to be no app consuming battery during the night period?

  • How much battery did you have in the morning after leaving the iPhone XS overnight without a charger? The iPhone battery life is optimized to be used during a long period daily during a routine. Commented Dec 11, 2022 at 16:35
  • I don't recall of noting down the percentage at the night and at the morning, but I distinctly remember waking up in the morning, checking the battery consumption in the last 24 hours and seeing a flat graph, meaning there were almost no energy consumption during the overnight period, as one might expect
    – mrbolichi
    Commented Dec 12, 2022 at 8:18
  • Have you tried to calibrate your battery by letting it run completely to 0% and then straight to 100% without distractions? Commented Dec 12, 2022 at 17:34
  • @AkiraTaguchi I'm not very keen on letting my battery discharges completely. Is there any other way to trigger a calibration?
    – mrbolichi
    Commented Dec 14, 2022 at 21:21
  • This is not about triggering a calibration. Any Lithium-ion batteries are generally calibrated like this. You cannot "trigger" a battery calibration because it needs to actually learn how much you use your device in order for the OS to learn how much battery would actually be left. Commented Dec 15, 2022 at 7:42


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