Ios Update And Battery Drain. A new iOS update drains battery because of the many big changes to your iPhone features that come with installing the most recent iOS software. There are many possible reasons as to why this happens.
Now, to begin with, don't put too much stock into the Maximum Capacity number. It enables to fix iPhone battery drain issue with a few minutes. Go Settings > General -> Background App Refresh and toggle this OFF.
They also receive a 'Charging on Hold' message on multiple occasions when charging.
It basically says that your phone is probably indexing a bunch of stuff after the update and therefore using more battery right now, but should return to normal soon.
But rest assured, the problem is most likely attributed to a software errors unless hardware damage is already present on your device even before the recent iOS update implementation. To start the conversation again, simply ask a new question. It enables to fix iPhone battery drain issue with a few minutes.