I've using Galaxy M30s for past 4 years without any issues but past 2 months I've faced Battery drain issue. Some Times a Full Charge hold for 10 to 12 hours for my moderate uses and some time Battery drains faster 100 to 82 percent from full charge without single time uses?
Note: Internet and Wife is Off and Background running apps also closed.
Kindly stop adaptive brightness, remove unused apps also put unused apps deep sleep or sleep mode, turn off location when necessary open than close, stop all background apps, use dark mode, use 60 Hz. refresh rate of display , also battery charge from 15% To 85% always. then try to it's again. If not resolves then go to service center for replace battery. If you like please accept as a solution it's help to others users also, click 3dots in my reply section and click on accept solution. Thanks.
First to insure health of battery.. Just use phone in power saving mode+disable sensor based activity like auto bright, light sensor, always on finger print, double tap wake up or lock.
Just phone without sensors at least 10 days.
If it gives proper time then enable sensors one by one and get time difference.
