It has long been a complaint that users have: following an update to one's iOS device, the battery drains unusually quickly.
Here is what Apple says about this situation: "It's normal for your apps and features to need to adjust up to 48 hours after an update."
Of course, it is possible that additional features – not previously installed – are the cause of some of this battery drainage. And I suppose that some, or many, users find this problem lasting far longer than 48 hours.
Just quoting Apple. Just sayin'.
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