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I did not look at my usage but I took my phone off the charger on Friday morning and I didn't put it back on until 10 pm on Saturday evening. I'd used quite a bit for web browsing, social media, a few youtube videos, messages and music.
 
Can you check how much affect does disabling screen time have on each one?
I tested mine with screen time turned off and not really noticeable difference.
Result: 1 hour 54 minutes SOT and 69 hours standby, battery from 100% > 36%.
I finally got one day more standby but I had unusual situation and did not use my phone much daily (approx. 38 minutes/day).

As you can see from my previous message, another better phone dropped only to 44% in about same time but about 40 minutes longer SOT, and that was with screen time on.
 
Did my X battery finally bite the dust or are others also seeing huge increase in stand by battery drain after IOS 12.1.4?

Until that stand by battery drain was only thing that was reasonable, mine's been "drinking" battery a lot during use or when I carried it with my but it would go over night with around 5% drain, now it is about double, sometimes little less. I noticed it right after IOS 12.1.4 update.

When measuring that, please remember that when battery is 100% it does not actually go down to 99% until battery is really 95-94%.
 
Did my X battery finally bite the dust or are others also seeing huge increase in stand by battery drain after IOS 12.1.4?

Until that stand by battery drain was only thing that was reasonable, mine's been "drinking" battery a lot during use or when I carried it with my but it would go over night with around 5% drain, now it is about double, sometimes little less. I noticed it right after IOS 12.1.4 update.

When measuring that, please remember that when battery is 100% it does not actually go down to 99% until battery is really 95-94%.

It’s a common problem since 12.0. Battery drain overnight with Tap to Wake and Screen Time on is almost 10%.
 
I know but as I said it happened after IOS 12.1.4. Until that (for example with IOS 12.1.3) overnight drain was practically half of what it is now. I have kept Screen Time off for some time already, so it is not that.

I have also noticed that Tap to Wake is something working very bad. One day it was not waking when I tapped the screen, and after lifting it up I kept tapping the screen and nothing happened but immediately after pressing the side button it woke up and worked just fine.
 
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