After I bought rog phone 2 from flipkart in India battery was good for almost 2 weeks. Then the battery started to show abnormal drainage. After a month of use the battery of 6000mah doesn't even lasts for 3 hours of playing games. This battery of Asus rog phone 2 feels like 3000 mah rather than of 6000 mah. I think many like me has started facing this issue in this phone. I hope Asus will look into this issue asap and fix this drainage issue is next update.
It should definitely be able to last for more than 3 hours but I don't know if you also use your phone for a lot of other things? Please download "App Usage - Manage/Track Usage" It will give you a very detailed summary of the apps you've been using. Unfortunately, it can only show foreground usage. Permit Android Usage Access and share the list here as a screen shot or Export Usage History & Activity history csv files