Battery auto drain

[A1N23K]

I just bought Asus Vivobook S15 OLED laptop recently. I noticed that my battery is auto draining while in shut down state. I charged the laptop to 79% and then i shut down it but when i opened it next day the battery was 67%😢. Why is that, please help

[Falcon_ASUS]

@A1N23K 
May I inquire whether your BIOS and system versions have been updated to the latest versions?
If you've used MyASUS to check the battery, have any errors appeared?
[Notebook] MyASUS - System Diagnosis
Thank you.

[A1N23K]

My BIOS and Windows are Updated to latest Version. I have also checked battery on MyASUS app, there's no issue shown there.

[Falcon_ASUS]

@A1N23K
According to what you described, I would recommend sending your laptop for repair to confirm whether there is an abnormal electrical leakage from components on the motherboard. 
The following is the contact information:
https://www.asus.com/support/service-center-location 

Also you can contact the local service center for help.
The following is the contact information:
https://www.asus.com/support/CallUs# 

Sorry for any inconvenience it may be caused.