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I've noticed that I lose about 20% battery each hour while my phone is unattended and offline. I check the battery settings and find that no apps are running.

The phone is rooted, and I'm wondering what kind of cleanup I can do in terms of searching for viruses and botnets and doing some kind of deeper inspection of battery usage?

Samsung galaxy s10+

--UPDATE--

I'd like to start looking for botnet that would survive a successful re-rom: any methods of doing so would be greatly appreciated. I've been receiving "unauthorized network" errors while in airplane mode. This is an intermittent issue. I am trying to find a forum or a community where issues like this can be discussed. I've taken comprehensive logs at various suspicious cross periods. One of four nights I receive these issues, for example. I vigilantly reproduce steps to be sure that each night the conditions of the phone are the same: turn all apps off, restart the phone, put it into airplane mode, turn the screen off, leave it unplugged.

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  • You can install Better Battery Statistics and check for app /Wakelock/alarms causing the drain. That could be the first step. Also check for Wakelocks
    – beeshyams
    Commented Jun 27, 2020 at 4:39
  • This answer has more details
    – beeshyams
    Commented Jun 27, 2020 at 5:19
  • Thank you. Some progress: "island" wasn't working properly and it seems turning apps on and off was causing a lot of rapid battery drain. I'm concerned about spyware that would survive a re-rom, primarily, still. And I still get intermittent rapid battery drain, although removing the island app temporarily has helped. Not able to get island working properly, unfortunately. Wondering how I would check to see if a hidden network is attached to my phone?
    – Wolfpack'08
    Commented Jul 25, 2020 at 0:50

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