Please tell us some basic information before asking for help:
Model Name: Zenfone Max Pro (M1) [ZB602KL]
Firmware Version: WW-16.2017.2009.087
Rooted or not: No
Frequency of Occurrence: Since last firmware updates first week of September 2020
APP Name & APP Version (If your issue relates to the app):
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.
I've done some research and read few same problems regarding this phone and last firmware updates (.087).
I'm experiencing the same problem related to draining battery overnight in idle state. I strongly think it's not about the battery itself having the problem but it's more about the bugs coming with the last firmware updates. Many people experiencing batteray drain issue with the same firmware updates.
And all your team suggesting just either charging our phone in safe mode or just throw "reset your phone" card useless solution to our faces. I find it useless because people still getting the exact problem so i think it's the bug coming with this firmware updates that causes the phone's battery draining fast when it's not used.
Hereby i attached my latest battery usage and it seems pretty abnormal. I have set my battery safer on, on purpose. And my SOT is just less than an hour with less than half hour only using two apps but the battery draining already down for almost 10% just less than an hour. I don't instal any apps since months ago and nothing changed with my phone and my daily usage is literally the same. I just feel the drained battery issue starts happening since last updates early of this month.
Please review your system updates and please fix this bug issue because my core decision i choose this phone because its huge battery capacity but i don't feel the exellence of its battery performance now.