Please tell us some basic information before asking for help:
Model Name: Zenfone 6 (6Z in India)
Rooted or not: No
Frequency of Occurrence: Regular
APP Name & APP Version (If your issue relates to the app): N/A
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
After the recent 1 Aug 2020 security update, it definitely seems to me that the battery drains out pretty quickly, compared to before update scenario. To clarify, no new apps or any modification has been done in the phone after security update. Earlier, a day or day and a half battery storage was a normal, but after this update battery is struggling to even keep up for 23-24 hrs. I have even tried keeping the phone on Airplane mode in between, but still nothing more than a day of usage.