iPhone XS Max Battery percent Dropped a lot overnight

[Aljon]

Hello, it's just happened yesterday and today, I leave my phone before i sleep, idle with open wifi from 94% and then i woke up the battery is already at 78% is that normal dropping 16% in 6hrs and 20 minutes? Just happened when i updated it 13.2.2. Before it doesn't droped too much, It only drops at 3-5% overnight. Was it software issue? And im not that kind of person leaving charged overnight. Battery Health is 97% using a 12w apple charger. Do you guys think fake/non-oem battery works on iPhone XS Max?

Screenshot.
i slept 1:00 AM and then woke up 7:20 AM

 

[coffeeplease]

If you just updated to 13.2.2, then it's probably doing some system stuff in the background. Just leave it charged overnight for a night and it should be fine.

 

[Nepherte]

I'd say you're lucky. My iphone XS drops 40% overnight (8 hours) without using it (on wifi, no background app refresh). I contacted Apple Support and their reply is "we don't see anything abnormal".

 

[Aljon]

40% is too much whats ur battery health?

 

[Nepherte]

40% is too much whats ur battery health?

96%. Yesterday did a ios recovery and for now things seem to be back to normal. Fingers crossed.