my iphone 11 is doing the same thing, did update on wednesday and my battery started draining on thursday. i called apple and they did a diagnostic of my battery and said it was fine. i went to bed last night with 89% and was down to 67% when i woke up. i even put is on airplane mode while i showered and got ready for work. it went down to 48% even on airplane mode!! this is so frustrating because i used to go 1 1/2 days before charging.
schollphone
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