u/Equal-Event9041

My newly bought OnePlus 13r has a huge battery drain. Yesterday, I received my 13r and got a software update of Oxygen OS 16 and an update to it. The SoT from 95% to 11% is like only 5h 17 mins

I thought it would be at least 8 to 10 h. I didn't even play any games. I just used it for daily use like insta reddit but status shows WhatsApp used 34.1% for 1 hr use.

Can this be fixed somehow or is this an issue with my mobile being having a weak battery.?