Battery drained by over 50% in under an hour

[Android Central Question]

IT'S been going on for a last couple of weeks , that I would see my phone lose insane amount of battery life in insanely short period of time. It had malware written all over it , so after numerous failed attempts to remove it via anti-malware apps , i opted for a factory reset. Needless to say, that turned out to be waste of time.
Before my next attempt to hard reset , I have taken SIM card out , and turned my Wi-Fi router off. Of , course prior to resetting the phone I have deleted all of the accounts and account data from the phone. This way I was able to skip Google account verification, and Samsung Cloud annoying attempts to restore data. I have than taken most of the system apps premissons, and to my surprise , I gained the permission to delete any app I choose.
It's Samsung S7 and I can't find a list of safe apps to remove.
Any idea anyone? Thanks on reading!

 

[Rukbat]

Check the battery graph in Settings. Do you see any sharp drops - big drops in zero time? If you do, the battery is bad. (It's called a dendrite, and we've been plagued with the problem since lithium batteries were invented.)